BACKGROUND
FIELD OF THE DISCLOSURE
[0001] The present disclosure relates to wireless communication systems, for example, and
more particularly to allocating time and frequency resources to a UL channel to carry
uplink control information used for narrowband communication.
DESCRIPTION OF RELATED ART
[0002] Wireless communication systems are widely deployed to provide various types of communication
content such as voice, video, packet data, messaging, broadcast, and so on. These
systems may be capable of supporting communication with multiple users by sharing
the available system resources (
e.g., time, frequency, and power). Examples of such multiple-access systems include code
division multiple access (CDMA) systems, time division multiple access (TDMA) systems,
frequency division multiple access (FDMA) systems, and orthogonal frequency division
multiple access (OFDMA) systems, (
e.g., a Long Term Evolution (LTE) system or LTE-Advanced (LTE-A) system). A wireless
multiple-access communication system may include a number of base stations, each simultaneously
supporting communication for multiple communication devices, which may be otherwise
known as user equipment (UE) devices. A base station may communicate with UE devices
on downlink channels (
e.g., for transmissions from a base station to a UE device) and uplink channels (
e.g., for transmissions from a UE device to a base station).
[0003] Some types of UE devices may communicate with a base station or other UE devices
using narrowband communication. Narrowband communication may include, for example,
narrowband LTE (NB-LTE) communication, M2M communication (of which Machine Type Communication
(MTC) may be considered a part for purposes of this disclosure), NB-Internet of Things
(NB-loT) communication,
etc.). Given the narrow bandwidth of narrowband communication, choices may need to be
made regarding the types of channels and signals to which narrowband resources are
allocated, as well as the manner in which narrowband resources are allocated to such
channels and signals and the configurations of such channels and signals.
SUMMARY
[0004] The present disclosure, for example, relates to techniques for allocating time and
frequency resources to an uplink (UL) channel used for narrowband communication. Resources
may be allocated to a UL channel for the purpose of transmitting or receiving information
such as downlink acknowledgements (ACKs), downlink non-acknowledgements (NAKs), or
channel quality information (CQI). In some cases, the UL channel may be a UL control
channel such as physical uplink control channel (PUCCH). In some examples, CQI may
not be transmitted on a UL channel, but may instead be transmitted on a physical uplink
shared channel (PUSCH) or not transmitted. When CQI is not transmitted from a UE device
to a base station, the base station may approximate channel state information (CSI)
in a number of ways. In some examples, resources may be allocated to a UL channel,
and resources of the UL channel may be allocated to a plurality of UE devices, in
ways that optimize (
e.g., maximize) the UE device transmission capacity of the UL channel and/or optimize
(
e.g., minimize) the transmission times of UE devices.
[0005] A method of wireless communication is described. The method may include identifying
time resources and frequency resources for narrowband communication in a plurality
of subframes, identifying a plurality of UE devices, allocating at least a first portion
of the time resources and the frequency resources to a UL channel to carry UL control
information, and allocating resources of the UL channel to the identified plurality
of UE devices.
[0006] An apparatus for wireless communication is described. The apparatus may include means
for identifying time resources and frequency resources for narrowband communication
in a plurality of subframes, means for identifying a plurality of UE devices, means
for allocating at least a first portion of the time resources and the frequency resources
to a UL channel to carry UL control information, and means for allocating resources
of the UL channel to the identified plurality of UE devices.
[0007] Another apparatus for wireless communication is described. The apparatus may include
a processor, memory in electronic communication with the processor, and instructions
stored in the memory. The instructions may be operable to cause the processor to identify
time resources and frequency resources for narrowband communication in a plurality
of subframes, identify a plurality of UE devices, allocate at least a first portion
of the time resources and the frequency resources to a UL channel to carry UL control
information, and allocate resources of the UL channel to the identified plurality
of UE devices.
[0008] A non-transitory computer readable medium for wireless communication is described.
The non-transitory computer-readable medium may include instructions operable to cause
a processor to identify time resources and frequency resources for narrowband communication
in a plurality of subframes, identify a plurality of UE devices, allocate at least
a first portion of the time resources and the frequency resources to an UL channel
to carry UL control information, and allocate resources of the UL channel to the identified
plurality of UE devices.
[0009] Some examples of the method, apparatus, and non-transitory computer-readable medium
described above may further include processes, features, means, or instructions for
receiving from one or more of the plurality of UE devices, on the UL channel, one
or both of downlink ACKs and downlink NAKs.
[0010] Some examples of the method, apparatus, and non-transitory computer-readable medium
described above may further include processes, features, means, or instructions for
multiplexing the UL channel with one or more of a physical uplink shared channel (PUSCH),
a physical random access channel (PRACH), a sounding reference signal (SRS), or a
combination thereof, in one or both of a time domain and a frequency domain.
[0011] In some examples of the method, apparatus, and non-transitory computer-readable medium
described above, the UL channel comprises a dedicated PUCCH.
[0012] Some examples of the method, apparatus, and non-transitory computer-readable medium
described above may further include processes, features, means, or instructions for
allocating a same number of resources of the UL channel to reference symbol transmissions
and data symbol transmissions.
[0013] In some examples of the method, apparatus, and non-transitory computer-readable medium
described above, allocating resources of the UL channel to the plurality of UE devices
comprises: allocating resources of the UL channel to the plurality of UE devices using
cross-slot code division multiplexing (CDM) in a time domain, CDM in a frequency domain,
frequency domain multiplexing (FDM), or a combination thereof.
[0014] Some examples of the method, apparatus, and non-transitory computer-readable medium
described above may further include processes, features, means, or instructions for
receiving, on the UL channel, a multiple tone transmission from the plurality of UE
devices.
[0015] Some examples of the method, apparatus, and non-transitory computer-readable medium
described above may further include processes, features, means, or instructions for
receiving on the UL channel, in parallel, a single tone transmission from the plurality
of UE devices.
[0016] Some examples of the method, apparatus, and non-transitory computer-readable medium
described above may further include processes, features, means, or instructions for
receiving from a UE device of the plurality of UE devices, in parallel on the UL channel,
a plurality of single tone transmissions.
[0017] In some examples of the method, apparatus, and non-transitory computer-readable medium
described above, allocating at least the first portion of the time resources and the
frequency resources to the UL channel comprises: allocating a same set of frequency
resources or a different set of frequency resources to the UL channel from one subframe
to another subframe in the plurality of subframes.
[0018] In some examples of the method, apparatus, and non-transitory computer-readable medium
described above, allocating resources of the UL channel to the plurality of UE devices
comprises: allocating resources of the UL channel to the plurality of UE devices using
intra-resource block frequency hopping.
[0019] In some examples of the method, apparatus, and non-transitory computer-readable medium
described above, the time resources and the frequency resources of the UL channel
allocated to the plurality of UE devices comprise bundled transmission time intervals
(TTIs).
[0020] Some examples of the method, apparatus, and non-transitory computer-readable medium
described above may further include processes, features, means, or instructions for
approximating CSI for at least one downlink of the narrowband communication based
at least in part on a measurement of an SRS, CQI for an uplink of the narrowband communication,
a CQI received on a PUSCH, or a combination thereof.
[0021] In some examples of the method, apparatus, and non-transitory computer-readable medium
described above, allocating resources of the UL channel to the plurality of UE devices
comprises: allocating resources of the UL channel to a UE device of the plurality
of UE devices based at least in part on a coverage enhancement (CE) level associated
with the UE device.
[0022] Some examples of the method, apparatus, and non-transitory computer-readable medium
described above may further include processes, features, means, or instructions for
transmitting an SRS during each symbol period of each subframe of the plurality of
subframes.
[0023] A method of wireless communication is described. The method may include identifying
time resources and frequency resources for narrowband communication in a plurality
of subframes, receiving an indication of at least a first portion of the time resources
and the frequency resources allocated to a UL channel to carry UL control information
for the UE device, and transmitting one or both of downlink ACKs and downlink NAKs
on the UL channel.
[0024] An apparatus for wireless communication is described. The apparatus may include means
for identifying time resources and frequency resources for narrowband communication
in a plurality of subframes, means for receiving an indication of at least a first
portion of the time resources and the frequency resources allocated to a UL channel
to carry UL control information for the UE device, and means for transmitting one
or both of downlink ACKs and downlink NAKs on the UL.
[0025] Another apparatus for wireless communication is described. The apparatus may include
a processor, memory in electronic communication with the processor, and instructions
stored in the memory. The instructions may be operable to cause the processor to identify
time resources and frequency resources for narrowband communication in a plurality
of subframes, receive an indication of at least a first portion of the time resources
and the frequency resources allocated to a UL channel to carry UL control information
for the UE device, and transmit one or both of downlink ACKs and downlink NAKs on
the UL channel.
[0026] A non-transitory computer readable medium for wireless communication is described.
The non-transitory computer-readable medium may include instructions operable to cause
a processor to identify time resources and frequency resources for narrowband communication
in a plurality of subframes, receive an indication of at least a first portion of
the time resources and the frequency resources allocated to a UL channel to carry
UL control information for the UE device, and transmit one or both of downlink ACKs
and downlink NAKs on the UL channel.
[0027] Some examples of the method, apparatus, and non-transitory computer-readable medium
described above may further include processes, features, means, or instructions for
transmitting a physical uplink shared channel (PUSCH), wherein the UL channel may
be multiplexed with the PUSCH.
[0028] In some examples of the method, apparatus, and non-transitory computer-readable medium
described above, the UL channel comprises a dedicated PUCCH.
[0029] Some examples of the method, apparatus, and non-transitory computer-readable medium
described above may further include processes, features, means, or instructions for
transmitting a same number of reference symbols and data symbols on the UL channel.
[0030] Some examples of the method, apparatus, and non-transitory computer-readable medium
described above may further include processes, features, means, or instructions for
transmitting on the UL channel using cross-slot CDM in a time domain, CDM in a frequency
domain, FDM, or a combination thereof.
BRIEF DESCRIPTION OF THE DRAWINGS
[0031] A further understanding of the nature and advantages of the present disclosure may
be realized by reference to the following drawings. In the appended figures, similar
components or features may have the same reference label. Further, various components
of the same may be distinguished by following the reference label by a dash and a
second label that distinguishes among the similar components. If just the first reference
label is used in the specification, the description is applicable to any one of the
similar components having the same first reference label irrespective of the second
reference label.
FIG. 1 shows an example of a wireless communication system, in accordance with various
aspects of the present disclosure;
FIG. 2 shows an example of a wireless communication system, in accordance with various
aspects of the present disclosure;
FIG. 3 shows time and frequency resource allocations that provide co-existence between
LTE and NB-LTE communications, in accordance with various aspects of the present disclosure;
FIG. 4 shows a time and frequency resource allocation for a UL channel usable for
narrowband communications (e.g., NB-LTE communications), in accordance with various aspects of the present disclosure;
FIG. 5 shows a time and frequency resource allocation for a UL channel usable for
narrowband communications (e.g., NB-LTE communications), in accordance with various aspects of the present disclosure;
FIG. 6 shows a time and frequency resource allocation a UL channel usable for narrowband
communications (e.g., NB-LTE communications), in accordance with various aspects of the present disclosure;
FIG. 7 shows single tone resources of a UL channel usable for narrowband communications
(e.g., NB-LTE communications), which single tone resources may be allocated to a narrowband
UE device in accordance with various aspects of the present disclosure;
FIG. 8 shows a time and frequency resource allocation for a UL channel usable for
narrowband communications (e.g., NB-LTE communications), in accordance with various aspects of the present disclosure;
FIG. 9 shows a time and frequency resource allocation within a superframe usable for
narrowband communications (e.g., NB-LTE communications), in accordance with various aspects of the present disclosure;
FIG. 10 shows a diagram of a device for use in wireless communication, in accordance
with various aspects of the present disclosure;
FIG. 11 shows a diagram of a wireless communication manager, in accordance with various
aspects of the present disclosure;
FIG. 12 shows a diagram of a device for use in wireless communication, in accordance
with various aspects of the present disclosure;
FIG. 13 shows a diagram of a wireless communication manager, in accordance with various
aspects of the present disclosure;
FIG. 14 shows a diagram of a base station (e.g., a base station forming part or all of an eNB) for use in wireless communication,
in accordance with various aspects of the present disclosure;
FIG. 15 shows a diagram of a UE device for use in wireless communication, in accordance
with various aspects of the present disclosure;
FIG. 16 is a flow chart illustrating an example of a method for wireless communication
at a base station, in accordance with various aspects of the present disclosure;
FIG. 17 is a flow chart illustrating an example of a method for wireless communication
at a base station, in accordance with various aspects of the present disclosure;
FIG. 18 is a flow chart illustrating an example of a method for wireless communication
at a base station, in accordance with various aspects of the present disclosure;
FIG. 19 is a flow chart illustrating an example of a method for wireless communication
at a base station, in accordance with various aspects of the present disclosure;
FIG. 20 is a flow chart illustrating an example of a method for wireless communication
at a UE device, in accordance with various aspects of the present disclosure; and
FIG. 21 is a flow chart illustrating an example of a method for wireless communication
at a UE device, in accordance with various aspects of the present disclosure.
DETAILED DESCRIPTION
[0032] The described features generally relate to improved systems, methods, and apparatuses
for allocating time and frequency resources to a UL channel to carry uplink control
information used for narrowband communication. In some examples, narrowband UE devices
may support very low throughput communications, be power efficient, be deployed indoors
or outdoors in sometimes challenging environments, be relatively low cost, or have
a reduced complexity (e.g., a narrowband UE device may not support circuit-switched
services or inter-radio access technology (RAT) mobility). In some examples, the density
of narrowband UE devices in a wireless communication system may be on the order of
hundreds or thousands per base station or access point, whereas the density of wideband
UE devices may be much lower.
[0033] Given the above differences between narrowband UE devices and wideband UE devices,
UL channels to carry uplink control information designed specifically for narrowband
communication may be desirable. In some cases, a UL channel may be an UL control channel
or dedicated UL control channel, for example a dedicated PUCCH. In some examples,
it may be desirable to retain the LTE/LTE-A resource allocation framework when allocating
resources to such an UL channel, to avoid resource fragmentation. In some examples,
a UL channel to carry uplink control information may be designed to optimize UE device
transmission capacity and/or UE device transmission times.
[0034] The following description provides examples, and is not limiting of the scope, applicability,
or examples set forth in the claims. Changes may be made in the function and arrangement
of elements discussed without departing from the scope of the disclosure. Various
examples may omit, substitute, or add various procedures or components as appropriate.
For instance, the methods described may be performed in an order different from that
described, and various steps may be added, omitted, or combined. Also, features described
with respect to some examples may be combined in other examples.
[0035] FIG. 1 shows an example of a wireless communication system 100, in accordance with various
aspects of the present disclosure. The wireless communication system 100 may include
base stations 105, UE devices 115, and a core network 130. The core network 130 may
provide user authentication, access authorization, tracking, Internet Protocol (IP)
connectivity, and other access, routing, or mobility functions. The base stations
105 may interface with the core network 130 through backhaul links 132 (
e.g., S1,
etc.) and may perform radio configuration and scheduling for communication with the UE
devices 115, or may operate under the control of a base station controller (not shown).
In various examples, the base stations 105 may communicate, either directly or indirectly
(
e.g., through core network 130), with each other over backhaul links 134 (
e.g., X2,
etc.), which may be wired or wireless communication links.
[0036] The base stations 105 may wirelessly communicate with the UE devices 115 via one
or more base station antennas. Each of the base station 105 sites may provide communication
coverage for a respective geographic coverage area 110. In some examples, a base station
105 may be referred to as a base transceiver station, a radio base station, an access
point, a radio transceiver, a NodeB, an eNodeB (eNB), a Home NodeB, a Home eNodeB,
or some other suitable terminology. The geographic coverage area 110 for a base station
105 may be divided into sectors (not shown) making up a portion of the coverage area.
The wireless communication system 100 may include base stations 105 of different types
(
e.g., macro or small cell base stations). There may be overlapping geographic coverage
areas 110 for different technologies.
[0037] In some examples, the wireless communication system 100 may include an LTE/LTE-A
network and may employ narrowband communication techniques, as described below. In
LTE/LTE-A networks, the term evolved Node B (eNB) may be used to describe the base
stations 105. The wireless communication system 100 may be a Heterogeneous LTE/LTE-A
network in which different types of eNBs provide coverage for various geographical
regions. For example, each eNB or base station 105 may provide communication coverage
for a macro cell, a small cell, or other types of cell. The term "cell" is a 3GPP
term that can be used to describe a base station, a carrier or component carrier associated
with a base station, or a coverage area (
e.g., sector,
etc.) of a carrier or base station, depending on context.
[0038] A macro cell may cover a relatively large geographic area (
e.g., several kilometers in radius) and may allow unrestricted access by UE devices with
service subscriptions with the network provider. A small cell may be a lower-powered
base station, as compared with a macro cell that may operate in the same or different
(
e.g., licensed, shared,
etc.) radio frequency spectrum bands as macro cells. Small cells may include pico cells,
femto cells, and micro cells according to various examples. A pico cell may cover
a relatively smaller geographic area and may allow unrestricted access by UE devices
with service subscriptions with the network provider. A femto cell also may cover
a relatively small geographic area (
e.g., a home) and may provide restricted access by UE devices having an association with
the femto cell (
e.g., UE devices in a closed subscriber group (CSG), UE devices for users in the home,
and the like). An eNB for a macro cell may be referred to as a macro eNB. An eNB for
a small cell may be referred to as a small cell eNB, a pico eNB, a femto eNB or a
home eNB. An eNB may support one or multiple (
e.g., two, three, four, and the like) cells (
e.g., component carriers).
[0039] The wireless communication system 100 may support synchronous or asynchronous operation.
For synchronous operation, the base stations may have similar frame timing, and transmissions
from different base stations may be approximately aligned in time. For asynchronous
operation, the base stations may have different frame timing, and transmissions from
different base stations may not be aligned in time. The techniques described herein
may be used for either synchronous or asynchronous operations.
[0040] The communication networks that may accommodate some of the various disclosed examples
may be packet-based networks that operate according to a layered protocol stack. In
the user plane, communications at the bearer or Packet Data Convergence Protocol (PDCP)
layer may be IP-based. A Radio Link Control (RLC) layer may perform packet segmentation
and reassembly to communicate over logical channels. A Medium Access Control (MAC)
layer may perform priority handling and multiplexing of logical channels into transport
channels. The MAC layer may also use Hybrid ARQ (HARQ) to provide retransmission at
the MAC layer to improve link efficiency. In the control plane, the Radio Resource
Control (RRC) protocol layer may provide establishment, configuration, and maintenance
of an RRC connection between a UE device 115 and the base stations 105 or core network
130 supporting radio bearers for the user plane data. At the Physical (PHY) layer,
the transport channels may be mapped to Physical channels.
[0041] The UE devices 115 may be dispersed throughout the wireless communication system
100, and each UE device 115 may be stationary or mobile. A UE device 115 may also
include or be referred to by those skilled in the art as a mobile station, a subscriber
station, a mobile unit, a subscriber unit, a wireless unit, a remote unit, a mobile
device, a wireless device, a wireless communications device, a remote device, a mobile
subscriber station, an access terminal, a mobile terminal, a wireless terminal, a
remote terminal, a handset, a user agent, a mobile client, a client, or some other
suitable terminology. A UE device 115 may be a cellular phone, a personal digital
assistant (PDA), a wireless modem, a wireless communication device, a handheld device,
a tablet computer, a laptop computer, a cordless phone, a wireless local loop (WLL)
station, a NB-LTE device, a M2M device, a MTC device, a NB-loT device or the like.
A UE device 115 may be able to communicate with various types of base stations 105
and network equipment, including macro eNBs, small cell eNBs, relay base stations,
and the like.
[0042] The communication links 125 shown in wireless communication system 100 may include
downlink (DL) transmissions, from a base station 105 to a UE device 115, or UL transmissions,
from a UE device 115 to a base station 105. The downlink transmissions may also be
called forward link transmissions, while the uplink transmissions may also be called
reverse link transmissions. The communication links 125 may include UL channel resources
for narrowband communication, as described in the present disclosure.
[0043] In some examples, each communication link 125 may include one or more carriers, where
each carrier may be a signal made up of multiple sub-carriers (
e.g., waveform signals of different frequencies) modulated according to the various radio
technologies described above. Each modulated signal may be sent on a different sub-carrier
and may carry control information (
e.g., reference signals, control channels,
etc.), overhead information, user data,
etc. The communication links 125 may transmit bidirectional communications using a frequency
division duplexing (FDD) operation (
e.g., using paired spectrum resources) or a time division duplexing (TDD) operation (
e.g., using unpaired spectrum resources). Frame structures for FDD operation (
e.g., frame structure type 1) and TDD operation (
e.g., frame structure type 2) may be defined.
[0044] FIG. 2 shows an example of a wireless communication system 200, in accordance with various
aspects of the present disclosure. The wireless communication system 200 may be an
example of a portion of the wireless communication system 100, and may include a first
base station 105-a, a second base station 105-b, a first UE device 115-a, and a second
UE device 115-b.
[0045] In some examples, the first base station 105-a may communicate with the first UE
device 115-a using wideband communication, and the second base station 105-b may communicate
with the second UE device 115-b using narrowband communication. The wideband communication
and narrowband communication may occur within the same radio frequency spectrum, and
thus, it may be desirable to allocate resources for wideband communication and narrowband
communication in a manner that enables co-existence of the devices communicating using
wideband communication and the devices using narrowband communication.
[0046] In some examples of the wireless communication system 200, the first base station
105-a may be additionally capable of narrowband communication, or the second base
station 105-b may be additionally capable of wideband communication. Similarly, the
first UE device 115-a may be additionally capable of narrowband communication, or
the second UE device 115-b may be additionally capable of wideband communication.
[0047] FIG. 3 shows time and frequency resource allocations 300 that provide co-existence between
LTE and NB-LTE communications, in accordance with various aspects of the present disclosure.
The LTE communications may occur between a first base station and a set of LTE-capable
UE devices. The NB-LTE communications may occur between the first base station (or
a second base station) and a set of NB-LTE-capable UE devices. A particular UE device
may be included in the set of LTE-capable UE devices, the set of NB-LTE-capable UE
devices, or the set of LTE-capable UE devices and the set of NB-LTE-capable UE devices.
In some examples, the first base station and second base station may be examples of
the base stations 105 described with reference to FIGs. 1 and 2, and the LTE-capable
UE devices and NB-LTE-capable UE devices may be examples of the UE devices 115 described
with reference to FIGs. 1 and 2.
[0048] To provide co-existence between LTE and NB-LTE communications, time and frequency
resources may be allocated for NB-LTE communications within a resource allocation
framework based at least in part on LTE OFDM numerology and LTE resource blocks. In
a first example of NB-LTE resource allocation, out-of-band LTE resources (
e.g., resources located outside an LTE system bandwidth 305) may be allocated for NB-LTE
communications. In some examples, the out-of-band LTE resources allocated for NB-LTE
communications may be located in a guard band 310 adjacent the LTE system bandwidth
305. In second and third examples of NB-LTE resource allocation, in-band LTE resources
(
e.g., resources located inside the LTE system bandwidth 305) may be allocated for NB-LTE
communications. In the second example, the in-band LTE resources allocated for NB-LTE
communications may be located in a set of resource blocks 315 spanning a same subset
of frequency resources in each subframe. In the third example, the in-band LTE resources
allocated for NB-LTE communications may be located in different resource blocks in
different subframes (
e.g., a first set of resource blocks 320 spanning a first subset of frequency resources
may be determined to be unused for LTE communications, and thus available for NB-LTE
communications) during each subframe in a first set of subframes (
e.g., during subframes SF0, SF1, and SF2) and a second set of resource blocks 325 spanning
a second subset of frequency resources may be determined to be unused for LTE communications,
and thus available for NB-LTE communications, during each subframe in a second set
of subframes (
e.g., during subframes SF2, SF3, and SF4).
[0049] When configuring a NB-LTE uplink, resources may need to be allocated to a plurality
of different channels or signals, such as a PRACH, a PUCCH, a PUSCH, or a SRS (
e.g., the PRACH, the PUCCH, the PUSCH, and the SRS may need to be multiplexed on the
NB-LTE uplink). Resources may also need to be allocated to a plurality of UE devices
(
e.g., resource allocations for different UE devices may need to be multiplexed on the
NB-LTE uplink). In some examples, the resources of a NB-LTE uplink may be allocated
to different channels/signals or UE devices using a LTE tone spacing, in which 12
tones are defined within the bandwidth of a single resource block. In other examples,
the number, granularity, or dimension of NB-LTE uplink resources may be increased
by using a NB-LTE tone spacing that is finer than LTE tone spacing. For example, 72
tones (
e.g., the equivalent of 6 LTE resource blocks) may be defined within the bandwidth of
a single LTE resource block and allocated to different channels/signals or UE devices
in a NB-LTE uplink.
[0050] In some examples, a base station may communicate with one or more UE devices using
a CE level, in which a greater transmit power or TTI bundling may be used to improve
reception at a receiving device (
e.g., a base station or UE device). TTI bundling may enable repetition of a transmission,
and repetition may improve detection or decoding of the transmission. In some examples,
a plurality of CE levels (
e.g., 4 CE levels), associated with different transmit powers or combinations of transmit
power and TTI bundling, may be defined.
[0051] NB-LTE uplink resource allocations that account for factors such as the multiplexing
of a plurality of channels/signals, the multiplexing of a plurality of UE devices,
or the use of one or more CE levels within a narrow band are described in the present
disclosure. The resource allocations may, for example, allocate NB-LTE resources (
e.g., the NB-LTE resources of a superframe) to a plurality of channels or signals (
e.g., a PRACH, a PUCCH, a PUSCH, and a SRS) using TDM, FDM, or a combination thereof,
and allocate NB-LTE resources to a plurality of UE devices using TDM, FDM, CDM in
a time domain, CDM in a frequency domain, or a combination thereof. The CDM in the
time domain may include, for example, cross-symbol CDM, cross-slot CDM, or cross-subframe
CDM.
[0052] In some examples, NB-LTE resources may be allocated a UL channel. In some examples,
NB-LTE frequency resources may be allocated to the UL channel by allocating a same
set of frequency resources to the UL channel for a first slot and a second slot of
each subframe in a plurality of subframes (
e.g., the frequency resources allocated to the UL channel may not hop from one resource
block to another resource block intra-subframe). In some examples, NB-LTE frequency
resources may be allocated to the UL channel by allocating a same set of frequency
resources or a different set of frequency resources to the UL channel from one subframe
to another subframe in the plurality of subframes. In some cases, the UL channel may
be an example of a UL control channel such as a dedicated PUCCH.
[0053] In some examples, CDM in the time domain may be used to allocate resources of the
UL channel to a plurality of UE devices. In these examples, CDM in the frequency domain
or FDM may also be used to allocate resources of the UL channel to the plurality of
UE devices. CDM in the frequency domain may provide more frequency diversity per UE
device when UE devices are associated with lower CE levels, and FDM may provide transmission
capacity for more UE devices when UE devices are associated with higher CE levels.
In some examples, FDM may be used to allocate resources of the UL channel to the plurality
of UE devices, but CDM may not be used.
[0054] In some examples, frequency resources of the UL channel may be allocated to a plurality
of UE devices with or without using intra-resource block frequency hopping. In some
examples, resources of the UL channel may be allocated to the plurality of UE devices
using bundled TTIs. In some examples, a same number of resources of the UL channel
may be allocated to reference symbols and data symbols.
[0055] In some examples, resources of the UL channel may be allocated to the plurality of
UE devices for transmitting downlink ACKs, downlink NAKs, CQI, or a combination thereof,
and a base station receiving the CQI may determine CSI for a NB-LTE downlink based
at least in part on the received CQI. In other examples, resources of the UL channel
may be allocated to the plurality of UE devices for transmitting downlink ACKs, downlink
NAKs, or a combination thereof, and a base station receiving the downlink ACKs or
downlink NAKs may approximate CSI for a NB-LTE downlink based at least in part on
measurement of a SRS, CQI for a NB-LTE uplink, CQI received on a PUSCH, or a combination
thereof. An approximation of CSI for the NB-LTE downlink may be sufficient, for example,
for a UE device operating deep in the base station's coverage area, because CQI reported
by the deep coverage UE device may be prone to inaccuracy, and given the long distance
between the base station and the deep coverage UE device, CQI for the NB-LTE uplink
and the NB-LTE downlink may be approximately the same.
[0056] In some examples, resources of the UL channel may be allocated to a UE device of
the plurality of UE devices based at least in part on a CE level associated with the
UE device.
[0057] According to an example, for UE devices associated with a higher CE level, single
tone resources may be used for an UL channel. The UL channel (
e.g., an ACK channel) may be allocated to one or more of the UE devices for the transmission
of downlink ACKs, downlink NAKs, or a combination thereof. FDM may be used for allocations
to different UE devices in the frequency domain when single tone resources are used
for the UL channel (
e.g., the ACK channel). In other examples, using CDM in frequency across a bandwidth
at a lower CE level for a number of UE devices may have a higher overall multiplexing
capacity than a single tone allocation multiplexed in the frequency domain as described
above.
[0058] In some examples, a single tone allocation, with CDM in the time domain, may be used
to allocate resources of an UL channel (
e.g., an ACK channel) to a plurality of UE devices. Two or more OFDM symbol periods may
be allocated to data or reference signal transmissions, including ACK transmissions.
The two or more OFDM symbol periods may be pairs of OFDM symbol periods. The OFDM
symbol periods may be adjacent in time, or non-adjacent.
[0059] In some cases, a system supporting an UL channel usable for narrowband communications
(
e.g., NB-LTE communications) may support multiple different techniques described herein
to allocate resources to UL channels, including for allocating an ACK channel, for
different UE devices. For example, a base station may support allocating single tone
resources for an ACK channel where resources are allocated to more than one UE device
using CDM in the time domain. The same base station may also support allocating a
single tone for an ACK channel, where resources for ACK channels for different UE
devices are allocated to different tones using FDM. The base station may also support
allocating an ACK channels for UE devices using CDM in both the time domain and the
frequency domain (
e.g., for a resource block). In some examples, a base station may select a technique
to allocate resources for UL channels, such as ACK channels, for each of one or more
UE devices based on channel characteristics associated with transmissions to and from
a UE device. For example, an allocation for an ACK channel to UE devices having good
channel characteristics may use techniques where the ACK channel is allocated using
CDM in both time and frequency domains for a resource block, while an allocation for
an ACK channel to UE devices having poor channel characteristics may use one of the
single tone allocation techniques described above. The base station may support different
allocation techniques between different resource blocks, for example between different
resource blocks of the same slot or same subframe, or across different slots or subframes.
[0060] FIG. 4 shows a time and frequency resource allocation 400 for a UL channel usable for narrowband
communications (
e.g., NB-LTE communications), in accordance with various aspects of the present disclosure.
The narrowband communications may occur between a base station and a set of narrowband
(
e.g., NB-LTE-capable) UE devices. In some examples, the base station may be an example
of the base stations 105 described with reference to FIGs. 1 and 2, and the narrowband
UE device may be an example of the UE devices 115 described with reference to FIGs.
1 and 2.
[0061] By way of example, the time and frequency resource allocation 400 may correspond
to a single LTE resource block 405 having 168 reference elements (
e.g., a resource block spanning twelve tones and fourteen OFDM symbol periods). The OFDM
symbol periods may define two slots (
e.g., a first slot 410 and a second slot 415) and one subframe 420. The OFDM symbol periods
of each slot are numbered 1 through 7. The resource elements associated with OFDM
symbol periods 3, 4, and 5 of each slot may be allocated for reference symbol transmissions,
and the resource elements associated with OFDM symbol periods 1, 2, 6, and 7 of each
slot may be allocated to data symbol transmissions (
e.g., downlink ACK/NAK transmissions), similarly to a time and frequency resource allocation
for a LTE PUCCH.
[0062] In some examples, the frequency resources allocated to the UL channel in FIG. 4 may
be a same set of frequency resources or a different set of frequency resources that
are allocated to the UL channel in one or more other subframes. In some cases, the
UL channel may be an example of a UL control channel such as a dedicated PUCCH.
[0063] In some examples, cross-slot CDM in the time domain may be used to allocate resources
of the UL channel to a plurality of UE devices. Cross-slot CDM in the time domain
may be enabled, at least in part, by allocating a same set of frequency resources
to the UL channel for the first slot and the second slot of each subframe (
e.g., by restricting intra-subframe frequency hopping between resource blocks when allocating
frequency resources to the UL channel within a subframe). In some examples, applying
the cross-slot CDM in the time domain may include applying an orthogonal cover code
to the eight OFDM symbol periods allocated to data symbol transmissions in the first
slot 410 and the second slot 415, and applying a discrete Fourier transform (DFT)
that has a spreading factor of 6 to the six OFDM symbol periods allocated to reference
symbol transmissions in the first slot 410 and the second slot 415. In some examples,
the cross-slot CDM may include cross-subframe CDM in the time domain. In some examples,
the cross-slot CDM in the time domain may be used with CDM in the frequency domain
to allocate resources of the UL channel to the plurality of UE devices. In other examples,
the cross-slot CDM in the time domain may be used with FDM to allocate resources of
the UL channel to the plurality of UE devices (
e.g., each UE device may be allocated one or more individual tones). In some examples,
the frequency resources of the time and frequency resource allocation 400 may be subdivided
into 72 tones.
[0064] FIG. 5 shows a time and frequency resource allocation 500 for a UL channel usable for narrowband
communications (
e.g., NB-LTE communications), in accordance with various aspects of the present disclosure.
The narrowband communications may occur between a base station and a set of narrowband
(
e.g., NB-LTE-capable) UE devices. In some examples, the base station may be an example
of a base station 105 described with reference to FIGs. 1 and 2, and the narrowband
UE device may be an example of a UE device 115 described with reference to FIGs. 1
and 2. In some cases, the UL channel may be an example of a UL control channel such
as a dedicated PUCCH.
[0065] By way of example, the time and frequency resource allocation 500 may correspond
to a pair of LTE resource blocks or subframes (
e.g., a first LTE resource block 505 or first subframe 510, and a second LTE resource
block 515 or second subframe 520) having a combined 336 reference elements (
e.g., each LTE resource block may span twelve tones and fourteen OFDM symbol periods).
The OFDM symbol periods of each LTE resource block may define two slots (
e.g., the OFDM symbol periods of the first LTE resource block 505 may define a first
slot 525 and a second slot 530, and the OFDM symbol periods of the second LTE resource
block 515 may define a third slot 535 and a fourth slot 540).
[0066] A same number of resources (
e.g., resource elements) of the UL channel may be allocated to reference symbol transmissions
and data symbol transmissions. For example, the resource elements included in the
second slot of each LTE resource block or subframe (
e.g., the resource elements included in the second slot 530 and the fourth slot 540)
may be allocated to reference symbol transmissions, and the resource elements included
in the first slot of each LTE resource block or subframe (
e.g., the first slot 525 and the third slot 535) may be allocated to data symbol transmissions.
Alternatively, the OFDM symbol periods of the UL channel may be alternately allocated
to reference symbol transmissions and data symbol transmissions. Allocations of multiple
consecutive OFDM symbol periods to reference symbol transmissions or data symbol transmissions
may in some cases provide better orthogonality and increased UE device transmission
capacity. Allocations of alternating OFDM symbol periods to reference symbol transmissions
or data symbol transmissions may in some cases provide better channel estimation.
In other alternatives, subframes (
e.g., the first subframe 510 and the second subframe 520) may be alternately allocated
to reference symbol transmissions and data symbol transmissions, or the resources
allocated to the UL channel may be equally allocated to reference symbol transmissions
and data symbol transmissions in other ways. An allocation of equal (same) numbers
of resources to reference symbol transmissions and data symbol transmissions may provide
better quality transmissions, and may enable spreading over a greater number of resources
(
e.g., DFT spreading by applying a DFT having a spreading factor of 7 times an orthogonal
cover code (
e.g., such that the spreading factor for DFT may be 7, 14, 21,
etc.), which can increase the transmission capacity of the UL channel to handle transmissions
of more UE devices. In some examples, the spreading factor may be limited by a TTI
bundling size, where TTI bundling size may be limited by device (
e.g., UE device) mobility.
[0067] In some examples, the frequency resources allocated to the UL channel in FIG. 4 may
be a same set of frequency resources or a different set of frequency resources that
are allocated to the UL channel in one or more other subframes.
[0068] In some examples, cross-subframe CDM in the time domain may be used to allocate resources
of the UL channel to a plurality of UE devices. Cross-subframe CDM in the time domain
may be enabled, at least in part, by allocating a same set of frequency resources
to the UL channel for the first subframe 510 and the second subframe 520 (
e.g., by restricting intra-subframe and inter-subframe frequency hopping between resource
blocks when allocating frequency resources to the UL channel within a subframe), though
inter-subframe frequency may be allowed when allocating resources of different TTI
bundles to the UL channel. In other examples, cross-slot CDM in the time domain and
FDM may be used to allocate resources of the UL channel to a plurality of UE devices
(
e.g., each UE device may be allocated one or more individual tones). In some examples,
the frequency resources of the time and frequency resource allocation 500 may be subdivided
into 72 tones.
[0069] FIG. 6 shows a time and frequency resource allocation 600 for a UL channel usable for narrowband
communications (
e.g., NB-LTE communications), in accordance with various aspects of the present disclosure.
The narrowband communications may occur between a base station and a set of narrowband
(
e.g., NB-LTE-capable) UE devices. In some examples, the base station may be an example
of the base stations 105 described with reference to FIGs. 1 and 2, and the narrowband
UE device may be an example of the UE devices 115 described with reference to FIGs.
1 and 2. In some cases, the UL channel may be an example of a UL control channel such
as a dedicated PUCCH.
[0070] By way of example, the time and frequency resource allocation 600 may correspond
to four LTE resource blocks or subframes (
e.g., a first LTE resource block 605 or first LTE subframe 610, a second LTE resource
block 615 or second LTE subframe 620, a third LTE resource block 625 or third subframe
630, and a fourth LTE resource block 635 or fourth subframe 640) having a combined
672 reference elements (
e.g., each LTE resource block may span twelve tones and fourteen OFDM symbol periods).
The OFDM symbol periods of each LTE resource block may define two slots (e.g., the
OFDM symbol periods of the first LTE resource block 605 may define a first slot 645
and a second slot 650,
etc.).
[0071] The TTIs (
e.g., slots) of the first LTE subframe 610 and the second LTE subframe 620 may be bundled,
and cross-subframe CDM in the time domain may be used to allocate the resources of
the first LTE resource block 605 and the second LTE resource block 615 to a plurality
of UE devices, as described with reference to FIG. 5. CDM in the frequency domain
or FDM may also be used to allocate the resources of the first LTE resource block
605 and the second LTE resource block 615 to the plurality of UE devices. The TTIs
of the third LTE resource block 625 and the fourth LTE resource block 635 may also
be bundled, and cross-subframe CDM in the time domain and other techniques described
with reference to FIG. 5 may be used to allocate the resources of the third LTE resource
block 625 and the fourth LTE resource block 635 to a plurality of UE devices.
[0072] The same or different frequency resources may be allocated to the slots and subframes
corresponding to bundled TTIs. As shown in FIG. 6, frequency hopping may be allowed
between two segments of bundled TTIs (
e.g., the frequency resources associated with different segments of bundled TTIs may
be the same or different). Frequency hopping within a bundled transmission can provide
frequency diversity.
[0073] The TTIs (
e.g., subframes) of the first LTE resource block 605 and the second LTE resource block
615 may be bundled, and cross-subframe CDM in the time domain may be used to allocate
the resources of the first LTE resource block 605 and the second LTE resource block
615 to a plurality of UE devices, as described with reference to FIG. 5. CDM in the
frequency domain or FDM may also be used to allocate the resources of the first LTE
resource block 605 and the second LTE resource block 615 to the plurality of UE devices.
The TTIs of the third LTE resource block 625 and the fourth LTE resource block 635
may also be bundled, and cross-subframe CDM in the time domain and other techniques
described with reference to FIG. 5 may be used to allocate the resources of the third
LTE resource block 625 and the fourth LTE resource block 635 to a plurality of UE
devices.
[0074] As shown in FIG. 6, the same frequency resources may be allocated to the slots and
subframes corresponding to bundled TTIs. However, cross-subframe frequency hopping
may be allowed between two segments of bundled TTIs (
e.g., the frequency resources associated with different segments of bundled TTIs may
be the same or different).
[0075] FIG. 7 shows single tone resources 700 of a UL channel usable for narrowband communications
(
e.g., NB-LTE communications), which single tone resources may be allocated to a narrowband
UE device in accordance with various aspects of the present disclosure. The narrowband
communications may occur between a base station and the narrowband UE device. In some
examples, the base station may be an example of the base stations 105 described with
reference to FIGs. 1 and 2, and the narrowband UE device may be an example of the
UE devices 115 described with reference to FIGs. 1 and 2. In some cases, the UL channel
may be an example of a UL control channel such as a dedicated PUCCH.
[0076] By way of example, single tone resources 700 may correspond to four LTE subframes
(
e.g., a first LTE subframe 705, a second LTE subframe 710, a third LTE subframe 715,
and a fourth LTE subframe 720). Each LTE subframe may span fourteen OFDM symbol periods.
The OFDM symbol periods of each LTE subframe may define two slots (
e.g., the OFDM symbol periods of the first LTE subframe 705 may define a first slot 725
and a second slot 730,
etc.).
[0077] The TTIs (
e.g., slots) of the first LTE subframe 705, the second LTE subframe 710, the third LTE
subframe 715, and the fourth LTE subframe 720 may be bundled. Within each TTI bundle,
the tones allocated to a UE device may hop frequency within a LTE resource block (cross-subframe,
as shown in FIG. 7, or cross-slot). Between TTI bundles, the tones allocated to the
UE device may hop frequency between LTE resource blocks. However, the frequency hopping
with a LTE resource block within a TTI bundle may interfere with the use of cross-slot
or cross-subframe CDM in the time domain.
[0078] In some cases, for example when UE devices may be associated with a higher CE level,
single tone resources 700 may be used for an UL channel. As further discussed above,
an UL channel (
e.g., an ACK channel) may be allocated to one or more of the UE devices for the transmission
of downlink ACKs, downlink NAKs, or a combination thereof. An ACK channel, or another
UL channel, may use the single tone resources 700 for the transmission of ACKs/NAKs.
A UE device may use the single tone resources 700 for a particular slot (
e.g., first slot 725) or subframe (
e.g., first subframe 705), with allocations for a number of different users (
e.g., narrowband UE devices) being frequency domain multiplexed across portions or all
of the bandwidth for the slot or subframe.
[0079] In some cases, the use of a higher CE level may result in a lower overall effective
bandwidth. Use of FDM for a single tone allocation for an ACK channel (or other UL
channel) may improve overall multiplexing capacity in cases where a higher CE level
is used. For example, overall multiplexing capacity when using a single tone allocation
FDMed across a bandwidth for a higher CE level may be an improvement in capacity with
respect to using CDM in frequency across the bandwidth for the higher CE level. In
other examples, such as for UE devices using a lower CE level, using CDM in frequency
across a bandwidth may have a higher overall multiplexing capacity than the single
tone allocation using FDM across the bandwidth for the users.
[0080] FIG. 8 shows a time and frequency resource allocation 800 for a UL channel usable for narrowband
communications (
e.g., NB-LTE communications), in accordance with various aspects of the present disclosure.
The narrowband communications may occur between a base station and a set of narrowband
(
e.g., NB-LTE-capable) UE devices. In some examples, the base station may be an example
of the base stations 105 described with reference to FIGs. 1 and 2, and the narrowband
UE device may be an example of the UE devices 115 described with reference to FIGs.
1 and 2. In some cases, the UL channel may be an example of a UL control channel such
as a dedicated PUCCH.
[0081] By way of example, the time and frequency resource allocation 800 may correspond
to a single LTE resource block 805 having 168 reference elements (
e.g., a resource block spanning twelve tones and fourteen OFDM symbol periods). The OFDM
symbol periods may define two slots (
e.g., a first slot 810 and a second slot 815) and one subframe 820. The OFDM symbol periods
of each slot are numbered 1 through 7. The resource elements associated with OFDM
symbol periods 2 and 6 of each slot may be allocated for reference symbol transmissions,
and the resource elements associated with OFDM symbol periods 1, 3, 4, 5, and 7 of
each slot may be allocated to data symbol transmissions (
e.g., CQI transmissions), similarly to a time and frequency resource allocation for a
LTE PUCCH. In some examples, the frequency resources allocated to the UL channel in
FIG. 8 may be a same set of frequency resources or a different set of frequency resources
that are allocated to the UL channel in one or more other subframes.
[0082] In some examples, CDM in the time domain may be used to allocate resources of the
UL channel to a plurality of UE devices. In some examples, applying the CDM in the
time domain may include applying an orthogonal cover code to pairs of the OFDM symbol
periods allocated to data symbol transmissions (
e.g., to a first OFDM symbol pair 825, a second OFDM symbol pair 830, a third OFDM symbol
pair 835, a fourth OFDM symbol pair 840, and a fifth OFDM symbol pair 845). Cross-slot
CDM in the time domain (
e.g., for applying an orthogonal cover code to the third OFDM symbol pair 835) may be
enabled, at least in part, by allocating a same set of frequency resources to the
UL channel for the first slot 810 and the second slot 815 of the subframe 820 (
e.g., by restricting intra-subframe frequency hopping between resource blocks when allocating
frequency resources to the UL channel within a subframe). Applying CDM in the time
domain may also include applying a spreading factor of 2 orthogonal cover codes (or
other CDM codes) to pairs of the OFDM symbol periods allocated to reference symbol
transmissions (
e.g., to a sixth OFDM symbol pair 850 and a seventh OFDM symbol pair 855). In some examples,
the CDM in the time domain may be used with CDM in the frequency domain to allocate
resources of the UL channel to the plurality of UE devices.
[0083] In other examples, the CDM in the time domain may be used with FDM to allocate resources
of the UL channel to the plurality of UE devices (
e.g., each UE device may be allocated one or more individual tones). For example, CDM
in the time domain may be used to allocate resources of a UL channel to a first set
of UE devices as described above for a single tone of LTE resource block 805, where
CDM may be applied (
e.g., by applying an orthogonal cover code) to more than one OFDM symbol periods allocated
to data or reference symbol transmissions for that tone. The more than one OFDM symbol
periods may be pairs of OFDM symbol periods as described above. In the example for
a single tone allocation, FDM may be applied, but CDM may not be applied in the frequency
domain. The code division multiplexed OFDM symbols may be frequency domain multiplexed
within LTE resource block 805.
[0084] For additional UE devices, such as a second set of UE devices, CDM in the time domain
may be applied similarly for one or more other tones of LTE resource block 805. CDM
may be applied to OFDM symbol periods for data or reference symbol periods.
[0085] In some examples as described above, one or more of the pairs of OFDM symbol periods
may carry one or more single tone ACKs or NAKs of one or more ACK channels for the
UE devices. Thus, an ACK channel (
e.g., to carry downlink ACKs and downlink NAKs) for a UE device may be a single tone
transmission with CDM in the time domain along with one or more other ACK channels
for other UE devices. The ACK channels may be frequency division multiplexed (and
not code division multiplexed in frequency) within LTE resource block 805.
[0086] In some examples, the frequency resources of the time and frequency resource allocation
800 may be subdivided into 72 tones.
[0087] FIG. 9 shows a time and frequency resource allocation 900 within a superframe 905 usable
for narrowband communications (
e.g., NB-LTE communications), in accordance with various aspects of the present disclosure.
The narrowband communications may occur between a base station and a set of narrowband
(
e.g., NB-LTE-capable) UE devices. In some examples, the base station may be an example
of the base stations 105 described with reference to FIGs. 1 and 2, and the narrowband
UE device may be an example of the UE devices 115 described with reference to FIGs.
land 2.
[0088] By way of example, the resources of the superframe 905 may be allocated to a PRACH,
a UL channel carrying UL control information, a PUSCH, and a SRS. In some cases, the
UL channel may be an example of a UL control channel such as a dedicated PUCCH. In
some examples, resources may be allocated to the SRS in each symbol period of each
subframe of the superframe. In some examples, resources may be allocated to the SRS
in a last symbol period of each subframe in which resources are allocated to the UL
channel or the PUSCH. The PRACH, the UL channel, the PUSCH, and the SRS may be multiplexed
on the resources of the superframe 905 in the time domain, the frequency domain, or
a combination thereof.
[0089] FIG. 10 shows a diagram 1000 of a device 1005 for use in wireless communication, in accordance
with various aspects of the present disclosure. The device 1005 may be an example
of aspects of one or more of the base stations 105 described with reference to FIGs.
1 and 2. The device 1005 may also be or include a processor. The device 1005 may include
a receiver 1010, a wireless communication manager 1020, or a transmitter 1030. Each
of these components may be in communication with each other.
[0090] The components of the device 1005 may, individually or collectively, be implemented
using one or more application-specific integrated circuits (ASICs) adapted to perform
some or all of the applicable functions in hardware. Alternatively, the functions
may be performed by one or more other processing units (or cores), on one or more
integrated circuits. In other examples, others of integrated circuits may be used
(
e.g., Structured/Platform ASICs, Field Programmable Gate Arrays (FPGAs), a System on
Chip (SoC), and/or others of Semi-Custom ICs), which may be programmed in any manner
known in the art. The functions of each component may also be implemented, in whole
or in part, with instructions embodied in a memory, formatted to be executed by one
or more general or application-specific processors.
[0091] In some examples, the receiver 1010 may include at least one radio frequency (RF)
receiver, such as at least one RF receiver operable to receive transmissions over
at least one radio frequency spectrum band. In some examples, one or more of the at
least one radio frequency spectrum band may be used for narrowband communications
(
e.g., NB-LTE communications), as described, for example, with reference to FIGs. 1-9.
The receiver 1010 may be used to receive various data or control signals over one
or more communication links of a wireless communication system, such as one or more
communication links of the wireless communication system 100 or 200 described with
reference to FIGs. 1 or 2.
[0092] In some examples, the transmitter 1030 may include at least one RF transmitter, such
as at least one RF transmitter operable to transmit over at least one radio frequency
spectrum band. The transmitter 1030 may be used to transmit various data or control
signals over one or more communication links of a wireless communication system, such
as one or more communication links of the wireless communication system 100 or 200
described with reference to FIGs. 1 or 2.
[0093] In some examples, the wireless communication manager 1020 may be used to manage one
or more aspects of wireless communication for the device 1005. In some examples, part
of the wireless communication manager 1020 may be incorporated into or shared with
the receiver 1010 or the transmitter 1030. In some examples, the wireless communication
manager 1020 may include a resource identifier 1035, a UE device identifier 1040,
a UL channel resource allocator 1045, or a UE device resource allocator 1050.
[0094] The resource identifier 1035 may be used to identify time resources and frequency
resources for narrowband communication in each subframe of a plurality of subframes.
The identified resources may include out-of-band resources or in-band resources, as
described with reference to FIG. 3. The UE device identifier 1040 may be used to identify
a plurality of UE devices (
e.g., UE devices needing uplink resources for narrowband communications). The UL channel
resource allocator 1045 may be used to allocate at least a first portion of the time
resources and the frequency resources to a UL channel. In some examples, a same set
of frequency resources may be allocated to the UL channel for a first slot and a second
slot of each subframe in the plurality of subframes. In some examples, a same set
of frequency resources or a different set of frequency resources may be allocated
to the UL channel from one subframe to another subframe in the plurality of subframes.
The UE device resource allocator 1050 may be used to allocate resources of the UL
channel to the identified plurality of UE devices. In some examples, the UL channel
may be an example of a UL control channel such as a dedicated PUCCH.
[0095] FIG. 11 shows a diagram 1100 of a wireless communication manager 1020-a, in accordance with
various aspects of the present disclosure. The wireless communication manager 1020-a
may be an alternative to the wireless communication manager 1020 described with reference
to FIG. 10, or may be provided in one or more of the base stations 105 described with
reference to FIGs. 1 and 2. The wireless communication manager 1020-a may be used
to manage one or more aspects of wireless communication for a base station. In some
examples, part of the wireless communication manager 1020-a may be incorporated into
or shared with a receiver or a transmitter of a device, such as the receiver 1010
or the transmitter 1030 of the device 1005 described with reference to FIG. 10. In
some examples, the wireless communication manager 1020-a may include a resource identifier
1035-a, a UE device identifier 1040-a, a UL channel resource allocator 1045-a, or
a UE device resource allocator 1050-a, which may be examples of the resource identifier
1035, the UE device identifier 1040, the UL channel resource allocator 1045, or the
UE device resource allocator 1050 described with reference to FIG. 10. The wireless
communication manager 1020-a may also include a PRACH resource allocator 1105, a PUSCH
resource allocator 1110, a SRS resource allocator 1115, or a feedback processor 1135.
[0096] The components of the wireless communication manager 1020-a may, individually or
collectively, be implemented using one or more ASICs adapted to perform some or all
of the applicable functions in hardware. Alternatively, the functions may be performed
by one or more other processing units (or cores), on one or more integrated circuits.
In other examples, other types of integrated circuits may be used (
e.g., Structured/Platform ASICs, FPGAs, a SoC, and/or other types of Semi-Custom ICs),
which may be programmed in any manner known in the art. The functions of each component
may also be implemented, in whole or in part, with instructions embodied in a memory,
formatted to be executed by one or more general or application-specific processors.
[0097] The resource identifier 1035-a may be used to identify time resources and frequency
resources for narrowband communication in each subframe of a plurality of subframes.
The identified resources may include out-of-band resources or in-band resources, as
described with reference to FIG. 3.
[0098] The UE device identifier 1040-a may be used to identify a plurality of UE devices
(e.g., UE devices needing uplink resources for narrowband communications).
[0099] The UL channel resource allocator 1045-a may be used to allocate at least a first
portion of the time resources and the frequency resources to a UL channel. In some
examples, a same set of frequency resources may be allocated to the UL channel for
a first slot and a second slot of each subframe in the plurality of subframes. In
some examples, a same set of frequency resources or a different set of frequency resources
may be allocated to the UL channel from one subframe to another subframe in the plurality
of subframes. In some examples, the UL channel may be an example of a UL control channel
such as a dedicated PUCCH.
[0100] The PRACH resource allocator 1105 may be used to allocate a second portion of the
time resources and the frequency resources to a PRACH. The PUSCH resource allocator
1110 may be used to allocate a third portion of the time resources and the frequency
resources to a PUSCH. The SRS resource allocator 1115 may be used to allocate a fourth
portion of the time resources and the frequency resources to a SRS. In some examples,
a combination of two or more of the UL channel resource allocator 1045-a, the PRACH
resource allocator 1105, the PUSCH resource allocator 1110, or the SRS resource allocator
1115 may multiplex the UL channel, the PRACH, the PUSCH, or the SRS in the time domain
(on the time resources identified for narrowband communication), the frequency domain
(on the frequency resources identified for narrowband communication), or a combination
thereof.
[0101] In some examples, the SRS resource allocator 1115 may allocate resources for transmitting
the SRS in each symbol period of each of the plurality of subframes. In some examples,
the SRS resource allocator 1115 may allocate resources for transmitting the SRS in
a last symbol period of each subframe in which resources are allocated to the UL channel
or the PUSCH.
[0102] The UE device resource allocator 1050-a may be used to allocate resources of the
UL channel to the identified plurality of UE devices. In some examples, resources
of the UL channel may be allocated to the plurality of UE devices using intra-resource
block frequency hopping. In some examples, resources of the UL channel may be additionally
or alternatively allocated to a UE device of the plurality of UE devices based at
least in part on a CE level associated with the UE device. In some examples, the resources
of the UL channel allocated to the plurality of UE devices may include bundled TTIs.
[0103] In some examples, the UE device resource allocator 1050-a may include a reference
symbol allocator 1120, a CDM allocator 1125, or a FDM allocator 1130. The reference
symbol allocator 1120 may be used to optionally allocate a same number of resources
of the UL channel to reference symbol transmissions and data symbol transmissions.
[0104] In some examples, the CDM allocator 1125 may be used to allocate resources of the
UL channel to the plurality of UE devices using cross-slot CDM in a time domain and
CDM in a frequency domain. Alternatively, the CDM allocator 1125 and the FDM allocator
1130 may be used to allocate resources of the UL channel to the plurality of UE devices
using cross-slot CDM in the time domain and FDM. In some examples, the cross-slot
CDM in the time domain may include cross-subframe CDM in the time domain.
[0105] The feedback processor 1135 may be used to receive at least one of downlink ACKs,
downlink NAKs, CQI, or a combination thereof from the plurality of UE devices. The
downlink ACKs, downlink NAKs, or CQI may be received on the UL channel. When resources
of the UL channel are allocated to the plurality of UE devices using cross-slot CDM
in a time domain and CDM in a frequency domain, the downlink ACKs, downlink NAKs,
or CQI may be received in a multiple tone transmission from each UE device. When resources
of the UL channel are allocated to the plurality of UE devices using cross-slot CDM
in the time domain and FDM, the downlink ACKs, downlink NAKs, or CQI may be received
in single tone transmissions from each UE device. In some examples, a plurality of
single tone transmissions may be received on the UL channel, in parallel, from one
or more of the UE devices.
[0106] In some examples, the feedback processor 1135 may include a CSI processor 1140. The
CSI processor 1140 may be used to determine CSI for at least one downlink of the narrowband
communication. The CSI may be determined based at least in part on CQI for the at
least one downlink received from one or more of the plurality of UEs devices. Alternatively,
the CSI processor 1140 may be used to approximate CSI for at least one downlink of
the narrowband communication. The CSI may be approximated based at least in part on:
measurement of a SRS, CQI for an uplink of the narrowband communication, CQI received
on a PUSCH, or a combination thereof.
[0107] FIG. 12 shows a diagram 1200 of a device 1215 for use in wireless communication, in accordance
with various aspects of the present disclosure. The device 1215 may be an example
of aspects of one or more of the UE devices 115 described with reference to FIGs.
1 and 2. The device 1215 may also be or include a processor. The device 1215 may include
a receiver 1210, a wireless communication manager 1220, or a transmitter 1230. Each
of these components may be in communication with each other.
[0108] The components of the device 1215 may, individually or collectively, be implemented
using one or more ASICs adapted to perform some or all of the applicable functions
in hardware. Alternatively, the functions may be performed by one or more other processing
units (or cores), on one or more integrated circuits. In other examples, others of
integrated circuits may be used (
e.g., Structured/Platform ASICs, FPGAs, a SoC, and/or others of Semi-Custom ICs), which
may be programmed in any manner known in the art. The functions of each component
may also be implemented, in whole or in part, with instructions embodied in a memory,
formatted to be executed by one or more general or application-specific processors.
[0109] In some examples, the receiver 1210 may include at least one RF receiver, such as
at least one RF receiver operable to receive transmissions over at least one radio
frequency spectrum band. In some examples, one or more of the at least one radio frequency
spectrum band may be used for narrowband communications (
e.g., NB-LTE communications), as described, for example, with reference to FIGs. 1-9.
The receiver 1210 may be used to receive various data or control signals over one
or more communication links of a wireless communication system, such as one or more
communication links of the wireless communication system 100 or 200 described with
reference to FIG. 1 or 2.
[0110] In some examples, the transmitter 1230 may include at least one RF transmitter, such
as at least one RF transmitter operable to transmit over at least one radio frequency
spectrum band. The transmitter 1230 may be used to transmit various data or control
signals over one or more communication links of a wireless communication system, such
as one or more communication links of the wireless communication system 100 or 200
described with reference to FIG. 1 or 2.
[0111] In some examples, the wireless communication manager 1220 may be used to manage one
or more aspects of wireless communication for the device 1215. In some examples, part
of the wireless communication manager 1220 may be incorporated into or shared with
the receiver 1210 or the transmitter 1230. In some examples, the wireless communication
manager 1220 may include a resource identifier 1235, a UL channel resource identifier
1240, or a feedback transmission manager 1245.
[0112] The resource identifier 1235 may be used to identify time resources and frequency
resources for narrowband communication in each subframe of a plurality of subframes.
The identified resources may include out-of-band resources or in-band resources, as
described with reference to FIG. 3. The UL channel resource identifier 1240 may be
used to receive an indication of at least a first portion of the time resources and
the frequency resources allocated to a UL channel for the UE device. The feedback
transmission manager 1245 may be used to transmit at least one of downlink ACKs, downlink
NAKs, CQI, or a combination thereof on the UL channel. In some cases, the UL channel
may be an example of a UL control channel such as a dedicated PUCCH.
[0113] FIG. 13 shows a diagram 1300 of a wireless communication manager 1220-a, in accordance with
various aspects of the present disclosure. The wireless communication manager 1220-a
may be an alternative to the wireless communication manager 1220 described with reference
to FIG. 12, or may be provided in one or more of the UE devices 115 described with
reference to FIGs. 1 and 2. The wireless communication manager 1220-a may be used
to manage one or more aspects of wireless communication for a UE device. In some examples,
part of the wireless communication manager 1220-a may be incorporated into or shared
with a receiver or a transmitter of a device, such as the receiver 1210 or the transmitter
1230 of the device 1215 described with reference to FIG. 12. In some examples, the
wireless communication manager 1220-a may include a resource identifier 1235-a, a
UL channel resource identifier 1240-a, or a feedback transmission manager 1245-a,
which may be examples of the resource identifier 1235, the UL channel resource identifier
1240, or the feedback transmission manager 1245 described with reference to FIG. 12.
[0114] The components of the wireless communication manager 1220-a may, individually or
collectively, be implemented using one or more ASICs adapted to perform some or all
of the applicable functions in hardware. Alternatively, the functions may be performed
by one or more other processing units (or cores), on one or more integrated circuits.
In other examples, other types of integrated circuits may be used (
e.g., Structured/Platform ASICs, FPGAs, a SoC, and/or other types of Semi-Custom ICs),
which may be programmed in any manner known in the art. The functions of each component
may also be implemented, in whole or in part, with instructions embodied in a memory,
formatted to be executed by one or more general or application-specific processors.
[0115] The resource identifier 1235-a may be used to identify time resources and frequency
resources for narrowband communication in each subframe of a plurality of subframes.
The identified resources may include out-of-band resources or in-band resources, as
described with reference to FIG. 3.
[0116] The UL channel resource identifier 1240-a may be used to receive an indication of
at least a first portion of the time resources and the frequency resources allocated
to a UL channel for the UE device. In some cases, the UL channel may be an example
of a UL control channel such as a dedicated PUCCH.
[0117] The feedback transmission manager 1245-a may be used to transmit at least one of
downlink ACKs, downlink NAKs, CQI, or a combination thereof on the UL channel. In
some examples, the feedback transmission manager 1245-a may include a CDM transmission
manager 1305 or a FDM transmission manager 1310. In some examples, the CDM transmission
manager 1305 may be used to transmit the downlink ACKs, downlink NAKs, and/or CQI
on the UL channel using cross-slot CDM in a time domain and CDM in a frequency domain.
Alternatively, the CDM transmission manager 1305 and FDM transmission manager 1310
may be used to transmit the downlink ACKs, downlink NAKs, and/or CQI on the UL channel
using cross-slot CDM in the time domain and FDM. In some examples, the cross-slot
CDM in the time domain may include cross-subframe CDM in the time domain.
[0118] In some examples of the device 1215, the feedback transmission manager 1245-a may
be used to transmit a same number of reference symbols and data symbols on the UL
channel.
[0119] FIG. 14 shows a diagram 1400 of a base station 105-c (
e.g., a base station forming part or all of an eNB) for use in wireless communication,
in accordance with various aspects of the present disclosure. In some examples, the
base station 105-c may be an example of aspects of one or more of the base stations
105 or the devices 1005 described with reference to FIGs. 1, 2, and 10. The base station
105-c may be configured to implement or facilitate at least some of the base station
features and functions described with reference to FIGs. 1-11.
[0120] The base station 105-c may include a base station processor 1410, a base station
memory 1420, at least one base station transceiver (represented by base station transceiver(s)
1450), at least one base station antenna (represented by base station antenna(s) 1455),
or a wireless communication manager 1020-b. The base station 105-c may also include
one or more of a base station communicator 1430 or a network communicator 1440. Each
of these components may be in communication with each other, directly or indirectly,
over one or more buses 1435.
[0121] The base station memory 1420 may include random access memory (RAM) or read-only
memory (ROM). The base station memory 1420 may store computer-readable, computer-executable
code 1425 containing instructions that are configured to, when executed, cause the
base station processor 1410 to perform various functions described herein related
to wireless communication, including, for example, allocating resources to UE devices
for narrowband communications on a PRACH, a dedicated PUCCH, a PUSCH, or a SRS, as
described with reference to FIGs. 1-11. Alternatively, the code 1425 may not be directly
executable by the base station processor 1410 but be configured to cause the base
station 105-c (
e.g., when compiled and executed) to perform various of the functions described herein.
[0122] The base station processor 1410 may include an intelligent hardware device,
e.g., a central processing unit (CPU), a microcontroller, an ASIC,
etc. The base station processor 1410 may process information received through the base
station transceiver(s) 1450, the base station communicator 1430, or the network communicator
1440. The base station processor 1410 may also process information to be sent to the
transceiver(s) 1450 for transmission through the antenna(s) 1455, to the base station
communicator 1430, for transmission to one or more other base stations 105-d and 105-e,
or to the network communicator 1440 for transmission to a core network 130-a, which
may be an example of one or more aspects of the core network 130 described with reference
to FIG. 1. The base station processor 1410 may handle, alone or in connection with
the wireless communication manager 1020-b, various aspects of communicating over (or
managing communications over) one or more radio frequency spectrum bands.
[0123] The base station transceiver(s) 1450 may include a modem configured to modulate packets
and provide the modulated packets to the base station antenna(s) 1455 for transmission,
and to demodulate packets received from the base station antenna(s) 1455. The base
station transceiver(s) 1450 may, in some examples, be implemented as one or more base
station transmitters and one or more separate base station receivers. The base station
transceiver(s) 1450 may support communication over one or more wireless communication
links. The base station transceiver(s) 1450 may be configured to communicate bi-directionally,
via the antenna(s) 1455, with one or more UE devices or other devices, such as one
or more of the UE devices 115 or devices 1215 described with reference to FIGs. 1,
2, and 12. The base station 105-c may, for example, include multiple base station
antennas 1455 (
e.g., an antenna array). The base station 105-c may communicate with the core network
130-a through the network communicator 1440. The base station 105-c may also communicate
with other base stations, such as the base stations 105-d and 105-e, using the base
station communicator 1430.
[0124] The wireless communication manager 1020-b may be configured to perform or control
some or all of the features or functions described with reference to FIGs. 1-11 related
to wireless communication over one or more radio frequency spectrum bands. The wireless
communication manager 1020-b, or portions of it, may include a processor, or some
or all of the functions of the wireless communication manager 1020-b may be performed
by the base station processor 1410 or in connection with the base station processor
1410. In some examples, the wireless communication manager 1020-b may be an example
of the wireless communication manager 1020 described with reference to FIGs. 10 and
11.
[0125] FIG. 15 shows a diagram 1500 of a UE device 115-c for use in wireless communication, in accordance
with various aspects of the present disclosure. The UE device 115-c may have various
configurations and may be a wireless communication device, a personal computer (
e.g., a laptop computer, a netbook computer, a tablet computer,
etc.), a handheld device, a cellular telephone, a smart phone, a cordless phone, a wireless
modem, a wireless local loop (WLL) station, a personal digital assistant (PDA), a
digital video recorder (DVR), an internet appliance, a gaming console, an e-reader,
etc. The UE device 115-c may, in some examples, have an internal power supply (not shown),
such as a small battery, to facilitate mobile or remote operation. In some examples,
the UE device 115-c may be an example of aspects of one or more of the UE devices
115 or the devices 1215 described with reference to FIGs. 1, 2, and 12. The UE device
115-c may be configured to implement at least some of the UE device features and functions
described with reference to FIGs. 1-9, 12, and 13.
[0126] The UE device 115-c may include a UE device processor 1510, a UE device memory 1520,
at least one UE device transceiver (represented by UE device transceiver(s) 1530),
at least one UE device antenna (represented by UE device antenna(s) 1540), or a wireless
communication manager 1220-b. Each of these components may be in communication with
each other, directly or indirectly, over one or more buses 1535.
[0127] The UE device memory 1520 may include RAM or ROM. The UE device memory 1520 may store
computer-readable, computer-executable code 1525 containing instructions that are
configured to, when executed, cause the UE device processor 1510 to perform various
functions described herein related to wireless communication, including, for example,
transmitting narrowband communications on a PRACH, a dedicated PUCCH, a PUSCH, or
a SRS, as described with reference to FIGs. 1-9, 12, and 13. Alternatively, the code
1525 may not be directly executable by the UE device processor 1510 but be configured
to cause the UE device 115-c (
e.g., when compiled and executed) to perform various of the functions described herein.
[0128] The UE device processor 1510 may include an intelligent hardware device,
e.g., a CPU, a microcontroller, an ASIC,
etc. The UE device processor 1510 may process information received through the UE device
transceiver(s) 1530 or information to be sent to the UE device transceiver(s) 1530
for transmission through the UE device antenna(s) 1540. The UE device processor 1510
may handle, alone or in connection with the wireless communication manager 1220-b,
various aspects of communicating over (or managing communications over) one or more
radio frequency spectrum bands.
[0129] The UE device transceiver(s) 1530 may include a modem configured to modulate packets
and provide the modulated packets to the UE device antenna(s) 1540 for transmission,
and to demodulate packets received from the UE device antenna(s) 1540. The UE device
transceiver(s) 1530 may, in some examples, be implemented as one or more UE device
transmitters and one or more separate UE device receivers. The UE device transceiver(s)
1530 may support communications over one or more wireless communication links. The
UE device transceiver(s) 1530 may be configured to communicate bi-directionally, via
the UE device antenna(s) 1540, with one or more base stations or other devices, such
as one or more of the base stations 105 or devices 1005 described with reference to
FIGs. 1, 2, and 10. While the UE device 115-c may include a single UE device antenna,
there may be examples in which the UE device 115-c may include multiple UE device
antennas 1540.
[0130] The wireless communication manager 1220-b may be configured to perform or control
some or all of the UE device features or functions described with reference to FIGs.
1-9, 12, and 13 related to wireless communication over one or more radio frequency
spectrum bands. The wireless communication manager 1220-b, or portions of it, may
include a processor, or some or all of the functions of the wireless communication
manager 1220-b may be performed by the UE device processor 1510 or in connection with
the UE device processor 1510. In some examples, the wireless communication manager
1220-b may be an example of the wireless communication manager 1220 described with
reference to FIGs. 12 and 13.
[0131] FIG. 16 is a flow chart illustrating an example of a method 1600 for wireless communication
at a base station, in accordance with various aspects of the present disclosure. For
clarity, the method 1600 is described below with reference to aspects of one or more
of the base stations 105 described with reference to FIGs. 1, 2, and 14, aspects of
the device 1005 described with reference to FIG. 10, or aspects of one or more of
the wireless communication managers 1020 described with reference to FIGs. 10, 11,
and 14. In some examples, a base station may execute one or more sets of codes to
control the functional elements of the base station to perform the functions described
below. Additionally or alternatively, the base station may perform one or more of
the functions described below using special-purpose hardware.
[0132] At block 1605, the method 1600 may include identifying time resources and frequency
resources for narrowband communication in each subframe of a plurality of subframes.
The identified resources may include out-of-band resources or in-band resources, as
described with reference to FIG. 3. The operation(s) at block 1605 may be performed
using the wireless communication manager 1020 described with reference to FIGs. 10,
11, and 14, or the resource identifier 1035 described with reference to FIGs. 10 and
11.
[0133] At block 1610, the method 1600 may include identifying a plurality of UE devices
(
e.g., UE devices needing uplink resources for narrowband communications). The operation(s)
at block 1610 may be performed using the wireless communication manager 1020 described
with reference to FIGs. 10, 11, and 14, or the UE device identifier 1040 described
with reference to FIGs. 10 and 11.
[0134] At block 1615, the method 1600 may include allocating at least a first portion of
the time resources and the frequency resources to a UL channel. In some examples,
a same set of frequency resources may be allocated to the UL channel for a first slot
and a second slot of each subframe in the plurality of subframes. In some examples,
a same set of frequency resources or a different set of frequency resources may be
allocated to the UL channel from one subframe to another subframe in the plurality
of subframes. In some cases, the UL channel may be an example of a UL control channel
such as a dedicated PUCCH. The operation(s) at block 1615 may be performed using the
wireless communication manager 1020 described with reference to FIGs. 10, 11, and
14, or the UL channel resource allocator 1045 described with reference to FIGs. 10
and 11.
[0135] At block 1620, the method 1600 may include allocating resources of the UL channel
to the identified plurality of UE devices. In some examples, resources of the UL channel
may be allocated to the plurality of UE devices using intra-resource block frequency
hopping. In some examples, resources of the UL channel may be additionally or alternatively
allocated to a UE device of the plurality of UE devices based at least in part on
a CE level associated with the UE device. In some examples, the resources of the UL
channel allocated to the plurality of UE devices may include bundled TTIs. The operation(s)
at block 1620 may be performed using the wireless communication manager 1020 described
with reference to FIGs. 10, 11, and 14, or the UE device resource allocator 1050 described
with reference to FIGs. 10 and 11.
[0136] Thus, the method 1600 may provide for wireless communication. It should be noted
that the method 1600 is just one implementation and that the operations of the method
1600 may be rearranged or otherwise modified such that other implementations are possible.
[0137] FIG. 17 is a flow chart illustrating an example of a method 1700 for wireless communication
at a base station, in accordance with various aspects of the present disclosure. For
clarity, the method 1700 is described below with reference to aspects of one or more
of the base stations 105 described with reference to FIGs. 1, 2, and 14, aspects of
the device 1005 described with reference to FIG. 10, or aspects of one or more of
the wireless communication managers 1020 described with reference to FIGs. 10, 11,
and 14. In some examples, a base station may execute one or more sets of codes to
control the functional elements of the base station to perform the functions described
below. Additionally or alternatively, the base station may perform one or more of
the functions described below using special-purpose hardware.
[0138] At block 1705, the method 1700 may include identifying time resources and frequency
resources for narrowband communication in each subframe of a plurality of subframes.
The identified resources may include out-of-band resources or in-band resources, as
described with reference to FIG. 3. The operation(s) at block 1705 may be performed
using the wireless communication manager 1020 described with reference to FIGs. 10,
11, and 14, or the resource identifier 1035 described with reference to FIGs. 10 and
11.
[0139] At block 1710, the method 1700 may include identifying a plurality of UE devices
(
e.g., UE devices needing uplink resources for narrowband communications). The operation(s)
at block 1710 may be performed using the wireless communication manager 1020 described
with reference to FIGs. 10, 11, and 14, or the UE device identifier 1040 described
with reference to FIGs. 10 and 11.
[0140] At block 1715, the method 1700 may include allocating at least a first portion of
the time resources and the frequency resources to a UL channel. In some examples,
a same set of frequency resources may be allocated to the UL channel for a first slot
and a second slot of each subframe in the plurality of subframes. In some examples,
a same set of frequency resources or a different set of frequency resources may be
allocated to the UL channel from one subframe to another subframe in the plurality
of subframes. In some cases, the UL channel may be an example of a UL control channel
such as a dedicated PUCCH. The operation(s) at block 1715 may be performed using the
wireless communication manager 1020 described with reference to FIGs. 10, 11, and
14, or the UL channel resource allocator 1045 described with reference to FIGs. 10
and 11.
[0141] At block 1720, the method 1700 may optionally include allocating a same number of
resources of the UL channel to reference symbol transmissions and data symbol transmissions.
The operation(s) at block 1720 may be performed using the wireless communication manager
1020 described with reference to FIGs. 10, 11, and 14, the UE device resource allocator
1050 described with reference to FIG. 10, or the reference symbol allocator 1120 described
with reference to FIG. 11.
[0142] At block 1725, the method 1700 may include allocating resources of the UL channel
to the identified plurality of UE devices. In some examples, resources of the UL channel
may be allocated to the plurality of UE devices using intra-resource block frequency
hopping. In some examples, resources of the UL channel may be additionally or alternatively
allocated to a UE device of the plurality of UE devices based at least in part on
a CE level associated with the UE device. In some examples, the resources of the UL
channel allocated to the plurality of UE devices may include bundled TTIs. The operation(s)
at block 1725 may be performed using the wireless communication manager 1020 described
with reference to FIGs. 10, 11, and 14, or the UE device resource allocator 1050 described
with reference to FIGs. 10 and 11.
[0143] Following the operation(s) at block 1725, the method 1700 may continue at block 1730
or block 1740. At block 1730, the method 1700 may include receiving from the plurality
of UE devices, on the UL channel, at least one of downlink ACKs, downlink NAKs, CQI,
or a combination thereof. The operation(s) at block 1730 may be performed using the
wireless communication manager 1020 described with reference to FIGs. 10, 11, and
14, or the feedback processor 1135 described with reference to FIG. 11.
[0144] At block 1735, the method 1700 may include determining CSI for at least one downlink
of the narrowband communication based at least in part on CQI received for the at
least one downlink from one or more of the plurality of UE devices (
e.g., at block 1730). The operation(s) at block 1735 may be performed using the wireless
communication manager 1020 described with reference to FIGs. 10, 11, and 14, or the
CSI processor 1140 described with reference to FIG. 11.
[0145] At block 1740, the method 1700 may include receiving from the plurality of UE devices,
on the UL channel, at least one of downlink ACKs, downlink NAKs, or a combination
thereof. The operation(s) at block 1740 may be performed using the wireless communication
manager 1020 described with reference to FIGs. 10, 11, and 14, or the feedback processor
1135 described with reference to FIG. 11.
[0146] At block 1745, the method 1700 may include approximating CSI for at least one downlink
of the narrowband communication based at least in part on: measurement of a SRS, CQI
for an uplink of the narrowband communication, CQI received on a PUSCH, or a combination
thereof. The operation(s) at block 1745 may be performed using the wireless communication
manager 1020 described with reference to FIGs. 10, 11, and 14, or the CSI processor
1140 described with reference to FIG. 11.
[0147] Thus, the method 1700 may provide for wireless communication. It should be noted
that the method 1700 is just one implementation and that the operations of the method
1700 may be rearranged or otherwise modified such that other implementations are possible.
[0148] FIG. 18 is a flow chart illustrating an example of a method 1800 for wireless communication
at a base station, in accordance with various aspects of the present disclosure. For
clarity, the method 1800 is described below with reference to aspects of one or more
of the base stations 105 described with reference to FIGs. 1, 2, and 14, aspects of
the device 1005 described with reference to FIG. 10, or aspects of one or more of
the wireless communication managers 1020 described with reference to FIGs. 10, 11,
and 14. In some examples, a base station may execute one or more sets of codes to
control the functional elements of the base station to perform the functions described
below. Additionally or alternatively, the base station may perform one or more of
the functions described below using special-purpose hardware.
[0149] At block 1805, the method 1800 may include identifying time resources and frequency
resources for narrowband communication in each subframe of a plurality of subframes.
The identified resources may include out-of-band resources or in-band resources, as
described with reference to FIG. 3. The operation(s) at block 1805 may be performed
using the wireless communication manager 1020 described with reference to FIGs. 10,
11, and 14, or the resource identifier 1035 described with reference to FIGs. 10 and
11.
[0150] At block 1810, the method 1800 may include identifying a plurality of UE devices
(
e.g., UE devices needing uplink resources for narrowband communications). The operation(s)
at block 1810 may be performed using the wireless communication manager 1020 described
with reference to FIGs. 10, 11, and 14, or the UE device identifier 1040 described
with reference to FIGs. 10 and 11.
[0151] At block 1815, the method 1800 may include allocating at least a first portion of
the time resources and the frequency resources to a UL channel. In some examples,
a same set of frequency resources may be allocated to the UL channel for a first slot
and a second slot of each subframe in the plurality of subframes. In some examples,
a same set of frequency resources or a different set of frequency resources may be
allocated to the UL channel from one subframe to another subframe in the plurality
of subframes. In some cases, the UL channel may be an example of a UL control channel
such as a dedicated PUCCH. The operation(s) at block 1815 may be performed using the
wireless communication manager 1020 described with reference to FIGs. 10, 11, and
14, or the UL channel resource allocator 1045 described with reference to FIGs. 10
and 11.
[0152] At block 1820, the method 1800 may optionally include allocating a same number of
resources of the UL channel to reference symbol transmissions and data symbol transmissions.
The operation(s) at block 1820 may be performed using the wireless communication manager
1020 described with reference to FIGs. 10, 11, and 14, the UE device resource allocator
1050 described with reference to FIG. 10, or the reference symbol allocator 1120 described
with reference to FIG. 11.
[0153] Following the operation(s) at block 1820, the method 1800 may continue at block 1825
or block 1835. At block 1825 or 1835, the method 1800 may include allocating resources
of the UL channel to the identified plurality of UE devices. In some examples, resources
of the UL channel may be allocated to the plurality of UE devices using intra-resource
block frequency hopping. In some examples, resources of the UL channel may be additionally
or alternatively allocated to a UE device of the plurality of UE devices based at
least in part on a CE level associated with the UE device. In some examples, the resources
of the UL channel allocated to the plurality of UE devices may include bundled TTIs.
[0154] At block 1825, the method 1800 may include allocating resources of the UL channel
to the plurality of UE devices using cross-slot CDM in a time domain and CDM in a
frequency domain. In some examples, the cross-slot CDM in the time domain may include
cross-subframe CDM in the time domain. The operation(s) at block 1825 may be performed
using the wireless communication manager 1020 described with reference to FIGs. 10,
11, and 14, the UE device resource allocator 1050 described with reference to FIGs.
10 and 11, or the CDM allocator 1125 described with reference to FIG. 11.
[0155] At block 1830, the method 1800 may include receiving, on the UL channel, a multiple
tone transmission from each UE device of the plurality of UE devices. The operation(s)
at block 1830 may be performed using the wireless communication manager 1020 described
with reference to FIGs. 10, 11, and 14, or the feedback processor 1135 described with
reference to FIG. 11.
[0156] At block 1835, the method 1800 may include allocating resources of the UL channel
to the plurality of UE devices using cross-slot CDM in the time domain and FDM. In
some examples, the cross-slot CDM in the time domain may include cross-subframe CDM
in the time domain. The operation(s) at block 1835 may be performed using the wireless
communication manager 1020 described with reference to FIGs. 10, 11, and 14, the UE
device resource allocator 1050 described with reference to FIGs. 10 and 11, or the
CDM allocator 1125 or FDM allocator 1130 described with reference to FIG. 11.
[0157] At block 1840, the method 1800 may include receiving on the UL channel, in parallel,
a single tone transmission from each UE device of the plurality of UE devices. In
some examples, a plurality of single tone transmissions may be received on the UL
channel, in parallel, from one or more of the UE devices. The operation(s) at block
1830 may be performed using the wireless communication manager 1020 described with
reference to FIGs. 10, 11, and 14, or the feedback processor 1135 described with reference
to FIG. 11.
[0158] Thus, the method 1800 may provide for wireless communication. It should be noted
that the method 1800 is just one implementation and that the operations of the method
1800 may be rearranged or otherwise modified such that other implementations are possible.
[0159] FIG. 19 is a flow chart illustrating an example of a method 1900 for wireless communication
at a base station, in accordance with various aspects of the present disclosure. For
clarity, the method 1900 is described below with reference to aspects of one or more
of the base stations 105 described with reference to FIGs. 1, 2, and 14, aspects of
the device 1005 described with reference to FIG. 10, or aspects of one or more of
the wireless communication managers 1020 described with reference to FIGs. 10, 11,
and 14. In some examples, a base station may execute one or more sets of codes to
control the functional elements of the base station to perform the functions described
below. Additionally or alternatively, the base station may perform one or more of
the functions described below using special-purpose hardware.
[0160] At block 1905, the method 1900 may include identifying time resources and frequency
resources for narrowband communication in each subframe of a plurality of subframes.
The identified resources may include out-of-band resources or in-band resources, as
described with reference to FIG. 3. The operation(s) at block 1905 may be performed
using the wireless communication manager 1020 described with reference to FIGs. 10,
11, and 14, or the resource identifier 1035 described with reference to FIGs. 10 and
11.
[0161] At block 1910, the method 1900 may include identifying a plurality of UE devices
(
e.g., UE devices needing uplink resources for narrowband communications). The operation(s)
at block 1910 may be performed using the wireless communication manager 1020 described
with reference to FIGs. 10, 11, and 14, or the UE device identifier 1040 described
with reference to FIGs. 10 and 11.
[0162] At block 1915, the method 1900 may include allocating at least a first portion of
the time resources and the frequency resources to a UL channel. In some examples,
a same set of frequency resources may be allocated to the UL channel for a first slot
and a second slot of each subframe in the plurality of subframes. In some examples,
a same set of frequency resources or a different set of frequency resources may be
allocated to the UL channel from one subframe to another subframe in the plurality
of subframes. In some cases, the UL channel may be an example of a UL control channel
such as a dedicated PUCCH. The operation(s) at block 1915 may be performed using the
wireless communication manager 1020 described with reference to FIGs. 10, 11, and
14, or the UL channel resource allocator 1045 described with reference to FIGs. 10
and 11.
[0163] At block 1920, the method 1900 may include allocating a second portion of the time
resources and the frequency resources to a PRACH. The operation(s) at block 1920 may
be performed using the wireless communication manager 1020 described with reference
to FIGs. 10, 11, and 14, the UE device resource allocator 1050 described with reference
to FIG. 10, or the PRACH resource allocator 1105 described with reference to FIG.
11.
[0164] At block 1925, the method 1900 may include allocating a third portion of the time
resources and the frequency resources to a PUSCH. The operation(s) at block 1925 may
be performed using the wireless communication manager 1020 described with reference
to FIGs. 10, 11, and 14, or the PUSCH resource allocator 1110 described with reference
to FIG. 11.
[0165] At block 1930, the method 1900 may include allocating a fourth portion of the time
resources and the frequency resources to a SRS. In some examples, resources for transmitting
the SRS may be allocated in each symbol period of each of the plurality of subframes.
In some examples, resources for transmitting the SRS may be allocated in a last symbol
period of each subframe in which resources are allocated to the UL channel or the
PUSCH. The operation(s) at block 1930 may be performed using the wireless communication
manager 1020 described with reference to FIGs. 10, 11, and 14, or the SRS resource
allocator 1115 described with reference to FIG. 11. The UL channel, the PRACH, the
PUSCH, and the SRS may be multiplexed in the time domain (on the time resources identified
for narrowband communication at block 1905), the frequency domain (on the frequency
resources identified for narrowband communication at block 1905), or a combination
thereof.
[0166] At block 1935, the method 1900 may optionally include allocating a same number of
resources of the UL channel to reference symbol transmissions and data symbol transmissions.
The operation(s) at block 1935 may be performed using the wireless communication manager
1020 described with reference to FIGs. 10, 11, and 14, or the reference symbol allocator
1120 described with reference to FIG. 11.
[0167] At block 1940, the method 1900 may include allocating resources of the UL channel
to the identified plurality of UE devices. In some examples, resources of the UL channel
may be allocated to the plurality of UE devices using intra-resource block frequency
hopping. In some examples, resources of the UL channel may be additionally or alternatively
allocated to a UE device of the plurality of UE devices based at least in part on
a CE level associated with the UE device. In some examples, the resources of the UL
channel allocated to the plurality of UE devices may include bundled TTIs. The operation(s)
at block 1940 may be performed using the wireless communication manager 1020 described
with reference to FIGs. 10, 11, and 14, or the UE device resource allocator 1050 described
with reference to FIGs. 10 and 11.
[0168] Thus, the method 1900 may provide for wireless communication. It should be noted
that the method 1900 is just one implementation and that the operations of the method
1900 may be rearranged or otherwise modified such that other implementations are possible.
[0169] In some examples, aspects of the methods 1600, 1700, 1800, or 1900 described with
reference to FIGs. 16-19 may be combined.
[0170] FIG. 20 is a flow chart illustrating an example of a method 2000 for wireless communication
at a UE device, in accordance with various aspects of the present disclosure. For
clarity, the method 2000 is described below with reference to aspects of one or more
of the UE devices 115 described with reference to FIGs. 1, 2, and 15, aspects of the
device 1215 described with reference to FIG. 12, or aspects of one or more of the
wireless communication managers 1220 described with reference to FIGs. 12, 13, and
15. In some examples, a UE device may execute one or more sets of codes to control
the functional elements of the UE device to perform the functions described below.
Additionally or alternatively, the UE device may perform one or more of the functions
described below using special-purpose hardware.
[0171] At block 2005, the method 2000 may include identifying time resources and frequency
resources for narrowband communication in each subframe of a plurality of subframes.
The identified resources may include out-of-band resources or in-band resources, as
described with reference to FIG. 3. The operation(s) at block 2005 may be performed
using the wireless communication manager 1220 described with reference to FIGs. 12,
13, and 15, or the resource identifier 1235 described with reference to FIGs. 12 and
13.
[0172] At block 2010, the method 2000 may include receiving an indication of at least a
first portion of the time resources and the frequency resources allocated to a UL
channel for the UE device. In some cases, the UL channel may be an example of a UL
control channel such as a dedicated PUCCH. The operation(s) at block 2010 may be performed
using the wireless communication manager 1220 described with reference to FIGs. 12,
13, and 15, or the UL channel resource identifier 1240 described with reference to
FIGs. 12 and 13.
[0173] At block 2015, the method 2000 may include transmitting at least one of downlink
ACKs, downlink NAKs, CQI, or a combination thereof on the UL channel. The operation(s)
at block 2015 may be performed using the wireless communication manager 1220 described
with reference to FIGs. 12, 13, and 15, or the feedback transmission manager 1245
described with reference to FIGs. 12 and 13.
[0174] Thus, the method 2000 may provide for wireless communication. It should be noted
that the method 2000 is just one implementation and that the operations of the method
2000 may be rearranged or otherwise modified such that other implementations are possible.
[0175] FIG. 21 is a flow chart illustrating an example of a method 2100 for wireless communication
at a UE device, in accordance with various aspects of the present disclosure. For
clarity, the method 2100 is described below with reference to aspects of one or more
of the UE devices 115 described with reference to FIGs. 1, 2, and 15, aspects of the
device 1215 described with reference to FIG. 12, or aspects of one or more of the
wireless communication managers 1220 described with reference to FIGs. 12, 13, and
15. In some examples, a UE device may execute one or more sets of codes to control
the functional elements of the UE device to perform the functions described below.
Additionally or alternatively, the UE device may perform one or more of the functions
described below using special-purpose hardware.
[0176] At block 2105, the method 2100 may include identifying time resources and frequency
resources for narrowband communication in each subframe of a plurality of subframes.
The identified resources may include out-of-band resources or in-band resources, as
described with reference to FIG. 3. The operation(s) at block 2105 may be performed
using the wireless communication manager 1220 described with reference to FIGs. 12,
13, and 15, or the resource identifier 1235 described with reference to FIGs. 12 and
13.
[0177] At block 2110, the method 2100 may include receiving an indication of at least a
first portion of the time resources and the frequency resources allocated to a UL
channel for the UE device. In some cases, the UL channel may be an example of a UL
control channel such as a dedicated PUCCH. The operation(s) at block 2110 may be performed
using the wireless communication manager 1220 described with reference to FIGs. 12,
13, and 15, or the UL channel resource identifier 1240 described with reference to
FIGs. 12 and 13.
[0178] At block 2115, the method 2100 may include transmitting at least one of downlink
ACKs, downlink NAKs, CQI, or a combination thereof on the UL channel. The operation(s)
at block 2115 may be performed using the wireless communication manager 1220 described
with reference to FIGs. 12, 13, and 15, or the feedback transmission manager 1245
described with reference to FIGs. 12 and 13.
[0179] Following the operation(s) at block 2110, the method 2100 may continue at block 2115
or block 2120. At block 2115 or 2120, the method 2100 may include transmitting at
least one of downlink ACKs, downlink NAKs, CQI, or a combination thereof on the UL
channel. At block 2115, the method 2100 may include transmitting the downlink ACKs,
downlink NAKs, and/or CQI on the UL channel using cross-slot CDM in a time domain
and CDM in a frequency domain. In some examples, the cross-slot CDM in the time domain
may include cross-subframe CDM in the time domain. The operation(s) at block 2115
may be performed using the wireless communication manager 1220 described with reference
to FIGs. 12, 13, and 15, the feedback transmission manager 1245 described with reference
to FIGs. 12 and 13, or the CDM transmission manager 1305 described with reference
to FIG. 13.
[0180] At block 2120, the method 2100 may include transmitting the downlink ACKs, downlink
NAKs, and/or CQI on the UL channel using cross-slot CDM in the time domain and FDM.
In some examples, the cross-slot CDM in the time domain may include cross-subframe
CDM in the time domain. The operation(s) at block 2120 may be performed using the
wireless communication manager 1220 described with reference to FIGs. 12, 13, and
15, the feedback transmission manager 1245 described with reference to FIGs. 12 and
13, or the CDM transmission manager 1305 or FDM transmission manager 1310 described
with reference to FIG. 13.
[0181] In some examples, the method 2100 may include transmitting a same number of reference
symbols and data symbols on the UL channel.
[0182] Thus, the method 2100 may provide for wireless communication. It should be noted
that the method 2100 is just one implementation and that the operations of the method
2100 may be rearranged or otherwise modified such that other implementations are possible.
[0183] The detailed description set forth above in connection with the appended drawings
describes examples and does not represent all of the examples that may be implemented
or that are within the scope of the claims. The terms "example" and "exemplary," when
used in this description, mean "serving as an example, instance, or illustration,"
and not "preferred" or "advantageous over other examples." The detailed description
includes specific details for the purpose of providing an understanding of the described
techniques. These techniques, however, may be practiced without these specific details.
In some instances, well-known structures and apparatuses are shown in block diagram
form in order to avoid obscuring the concepts of the described examples.
[0184] Information and signals may be represented using any of a variety of different technologies
and techniques. For example, data, instructions, commands, information, signals, bits,
symbols, and chips that may be referenced throughout the above description may be
represented by voltages, currents, electromagnetic waves, magnetic fields or particles,
optical fields or particles, or any combination thereof.
[0185] The various illustrative blocks and components described in connection with the disclosure
herein may be implemented or performed with a general-purpose processor, a digital
signal processor (DSP), an ASIC, an FPGA or other programmable logic device, discrete
gate or transistor logic, discrete hardware components, or any combination thereof
designed to perform the functions described herein. A general-purpose processor may
be a microprocessor, but in the alternative, the processor may be any conventional
processor, controller, microcontroller, or state machine. A processor may also be
implemented as a combination of computing devices, e.g., a combination of a DSP and
a microprocessor, multiple microprocessors, one or more microprocessors in conjunction
with a DSP core, or any other such configuration.
[0186] The functions described herein may be implemented in hardware, software executed
by a processor, firmware, or any combination thereof. If implemented in software executed
by a processor, the functions may be stored on or transmitted over as one or more
instructions or code on a computer-readable medium. Other examples and implementations
are within the scope and spirit of the disclosure and appended claims. For example,
due to the nature of software, functions described above can be implemented using
software executed by a processor, hardware, firmware, hardwiring, or combinations
of any of these. Features implementing functions may also be physically located at
various positions, including being distributed such that portions of functions are
implemented at different physical locations. As used herein, including in the claims,
the term "and/or," when used in a list of two or more items, means that any one of
the listed items can be employed by itself, or any combination of two or more of the
listed items can be employed. For example, if a composition is described as containing
components A, B, and/or C, the composition can contain A alone; B alone; C alone;
A and B in combination; A and C in combination; B and C in combination; or A, B, and
C in combination. Also, as used herein, including in the claims, "or" as used in a
list of items (for example, a list of items prefaced by a phrase such as "at least
one of" or "one or more of") indicates a disjunctive list such that, for example,
a list of "at least one of A, B, or C" means A or B or C or AB or AC or BC or ABC
(i.e., A and B and C).
[0187] Computer-readable media includes both computer storage media and communication media
including any medium that facilitates transfer of a computer program from one place
to another. A storage medium may be any available medium that can be accessed by a
general purpose or special purpose computer. By way of example, and not limitation,
computer-readable media can comprise RAM, ROM, EEPROM, CD-ROM or other optical disk
storage, magnetic disk storage or other magnetic storage devices, or any other medium
that can be used to carry or store desired program code means in the form of instructions
or data structures and that can be accessed by a general-purpose or special-purpose
computer, or a general-purpose or special-purpose processor. Also, any connection
is properly termed a computer-readable medium. For example, if the software is transmitted
from a website, server, or other remote source using a coaxial cable, fiber optic
cable, twisted pair, digital subscriber line (DSL), or wireless technologies such
as infrared, radio, and microwave, then the coaxial cable, fiber optic cable, twisted
pair, DSL, or wireless technologies such as infrared, radio, and microwave are included
in the definition of medium. Disk and disc, as used herein, include compact disc (CD),
laser disc, optical disc, digital versatile disc (DVD), floppy disk and Blu-ray disc
where disks usually reproduce data magnetically, while discs reproduce data optically
with lasers. Combinations of the above are also included within the scope of computer-readable
media.
[0188] The previous description of the disclosure is provided to enable a person skilled
in the art to make or use the disclosure. Various modifications to the disclosure
will be readily apparent to those skilled in the art, and the generic principles defined
herein may be applied to other variations without departing from the spirit or scope
of the disclosure. Throughout this disclosure the term "example" or "exemplary" indicates
an example or instance and does not imply or require any preference for the noted
example.
CLAUSES
[0189]
- 1. A method for wireless communication at a base station, comprising: identifying
time resources and frequency resources for narrowband communication in a plurality
of subframes; identifying a plurality of user equipment (UE) devices; allocating at
least a first portion of the time resources and the frequency resources to an uplink
(UL) channel to carry UL control information; and allocating resources of the UL channel
to the identified plurality of UE devices.
- 2. The method of clause 1, further comprising: receiving from one or more of the plurality
of UE devices, on the UL channel, one or both of downlink acknowledgements (ACKs)
and downlink non-acknowledgements (NAKs).
- 3. The method of clause 1, further comprising: multiplexing the UL channel with a
physical uplink shared channel (PUSCH), a physical random access channel (PRACH),
a sounding reference signal (SRS), or a combination thereof, in one or both of a time
domain and a frequency domain.
- 4. The method of clause 1, wherein the UL channel comprises a dedicated physical uplink
control channel (PUCCH).
- 5. The method of clause 1, further comprising: allocating a same number of resources
of the UL channel to reference symbol transmissions and data symbol transmissions.
- 6. The method of clause 1, wherein allocating resources of the UL channel to the plurality
of UE devices comprises: allocating resources of the UL channel to the plurality of
UE devices using cross-slot code division multiplexing (CDM) in a time domain, CDM
in a frequency domain, frequency domain multiplexing (FDM), or a combination thereof.
- 7. The method of clause 1, further comprising: receiving, on the UL channel, a multiple
tone transmission from the plurality of UE devices.
- 8. The method of clause 1, further comprising: receiving on the UL channel, in parallel,
a single tone transmission from the plurality of UE devices.
- 9. The method of clause 1, further comprising: receiving from a UE device of the plurality
of UE devices, in parallel on the UL channel, a plurality of single tone transmissions.
- 10. The method of clause 1, wherein allocating at least the first portion of the time
resources and the frequency resources to the UL channel comprises: allocating a same
set of frequency resources to the UL channel for a first slot and a second slot in
the plurality of subframes.
- 11. The method of clause 1, wherein allocating at least the first portion of the time
resources and the frequency resources to the UL channel comprises: allocating a same
set of frequency resources or a different set of frequency resources to the UL channel
from one subframe to another subframe in the plurality of subframes.
- 12. The method of clause 1, wherein allocating resources of the UL channel to the
plurality of UE devices comprises: allocating resources of the UL channel to the plurality
of UE devices using intra-resource block frequency hopping.
- 13. The method of clause 1, wherein the time resources and the frequency resources
of the UL channel allocated to the plurality of UE devices comprise bundled transmission
time intervals (TTIs).
- 14. The method of clause 1, further comprising: approximating channel state information
(CSI) for at least one downlink of the narrowband communication based at least in
part on a measurement of a sounding reference signal (SRS), channel quality information
(CQI) for an uplink of the narrowband communication, a CQI received on a physical
uplink shared channel (PUSCH), or a combination thereof.
- 15. The method of clause 1, wherein allocating resources of the UL channel to the
plurality of UE devices comprises: allocating resources of the UL channel to a UE
device of the plurality of UE devices based at least in part on a coverage enhancement
(CE) level associated with the UE device.
- 16. The method of clause 1, further comprising: transmitting a sounding reference
signal (SRS) during each symbol period of each subframe of the plurality of subframes.
- 17. An apparatus for wireless communication at a base station, comprising: a processor;
memory in electronic communication with the processor; and instructions stored in
the memory, the instructions being executable by the processor to cause the apparatus
to: identify time resources and frequency resources for narrowband communication in
a plurality of subframes; identify a plurality of user equipment (UE) devices; allocate
at least a first portion of the time resources and the frequency resources to an uplink
(UL) channel to carry UL control information; and allocate resources of the UL channel
to the identified plurality of UE devices.
- 18. The apparatus of clause 17, wherein the instructions are executable by the processor
to:
receive from one or more of the plurality of UE devices, on the UL channel, one or
both of downlink acknowledgements (ACKs) and downlink non-acknowledgements (NAKs).
- 19. The apparatus of clause 17, wherein the instructions are executable by the processor
to:
multiplex the UL channel with a physical uplink shared channel (PUSCH), a physical
random access channel (PRACH), a sounding reference signal (SRS), or a combination
thereof, in one or both of a time domain and a frequency domain.
- 20. The apparatus of clause 17, wherein the UL channel comprises a dedicated physical
uplink control channel (PUCCH).
- 21. The apparatus of clause 17, wherein the instructions are executable by the processor
to:
allocate a same number of resources of the UL channel to reference symbol transmissions
and data symbol transmissions.
- 22. The apparatus of clause 17, wherein the instructions executable by the processor
to allocate resources of the UL channel to the plurality of UE devices comprise instructions
executable by the processor to: allocate resources of the UL channel to the plurality
of UE devices using cross-slot code division multiplexing (CDM) in a time domain,
CDM in a frequency domain, frequency domain multiplexing (FDM), or a combination thereof.
- 23. The apparatus of clause 17, wherein the instructions executable by the processor
to allocate at least the first portion of the time resources and the frequency resources
to the UL channel comprise instructions executable by the processor to: allocate a
same set of frequency resources to the UL channel for a first slot and a second slot
in the plurality of subframes.
- 24. The apparatus of clause 17, wherein the instructions executable by the processor
to allocate at least the first portion of the time resources and the frequency resources
to the UL channel comprise instructions executable by the processor to: allocate a
same set of frequency resources or a different set of frequency resources to the UL
channel from one subframe to another subframe in the plurality of subframes.
- 25. The apparatus of clause 17, wherein the instructions executable by the processor
to allocate resources of the UL channel to the plurality of UE devices further comprise
instructions executable by the processor to: allocate resources of the UL channel
to the plurality of UE devices using intra-resource block frequency hopping.
- 26. The apparatus of clause 17, wherein the time resources and the frequency resources
of the UL channel allocated to the plurality of UE devices comprise bundled transmission
time intervals (TTIs).
- 27. The apparatus of clause 17, wherein the instructions executable by the processor
to allocate resources of the UL channel to the plurality of UE devices further comprise
instructions executable by the processor to: allocate resources of the UL channel
to a UE device of the plurality of UE devices based at least in part on a coverage
enhancement (CE) level associated with the UE device.
- 28. A method for wireless communication at a user equipment (UE) device, comprising:
identifying time resources and frequency resources for narrowband communication in
a plurality of subframes; receiving an indication of at least a first portion of the
time resources and the frequency resources allocated to an uplink (UL) channel to
carry UL control information for the UE device; and
transmitting one or both of downlink acknowledgements (ACKs) and downlink non-acknowledgements
(NAKs) on the UL channel.
- 29. The method of clause 28, further comprising: transmitting a physical uplink shared
channel (PUSCH), wherein the UL channel is multiplexed with the PUSCH.
- 30. The method of clause 28, wherein the UL channel comprises a dedicated physical
uplink control channel (PUCCH).
- 31. The method of clause 28, further comprising: transmitting a same number of reference
symbols and data symbols on the UL channel.
- 32. The method of clause 28, further comprising: transmitting on the UL channel using
cross-slot code division multiplexing (CDM) in a time domain, CDM in a frequency domain,
frequency domain multiplexing (FDM), or a combination thereof.
- 33. An apparatus for wireless communication at a user equipment (UE) device, comprising:
a processor; memory in electronic communication with the processor; and instructions
stored in the memory, the instructions being executable by the processor to: identify
time resources and frequency resources for narrowband communication in a plurality
of subframes; receive an indication of at least a first portion of the time resources
and the frequency resources allocated to an uplink (UL) channel to carry UL control
information for the UE device; and transmit one or both of downlink acknowledgements
(ACKs) and downlink non-acknowledgements (NAKs) on the UL channel.
- 34. The apparatus of clause 33, wherein the instructions are executable by the processor
to:
transmit a physical uplink shared channel (PUSCH), wherein the UL channel is multiplexed
with the PUSCH.
- 35. The apparatus of clause 33, wherein the UL channel comprises a dedicated physical
uplink control channel (PUCCH).
- 36. The apparatus of clause 33, wherein the instructions are executable by the processor
to:
transmit a same number of reference symbols and data symbols on the UL channel.
- 37. The apparatus of clause 33, wherein the instructions are executable by the processor
to:
transmit on the UL channel using cross-slot code division multiplexing (CDM) in a
time domain, CDM in a frequency domain, frequency domain multiplexing (FDM), or a
combination thereof.